diff --git a/client/src/lib/namespace.js b/client/src/lib/namespace.js
new file mode 100644
index 00000000..aeaddc7e
--- /dev/null
+++ b/client/src/lib/namespace.js
@@ -0,0 +1,30 @@
+'use strict';
+
+import React, { Component } from 'react';
+import { translate } from 'react-i18next';
+import { TreeTableSelect } from './form';
+
+
+@translate()
+class NamespaceSelect extends Component {
+    render() {
+        const t = this.props.t;
+
+        return (
+            <TreeTableSelect id="namespace" label={t('Namespace')} dataUrl="/rest/namespaces-tree"/>
+        );
+    }
+}
+
+function validateNamespace(t, state) {
+    if (!state.getIn(['namespace', 'value'])) {
+        state.setIn(['namespace', 'error'], t('Namespace must be selected'));
+    } else {
+        state.setIn(['namespace', 'error'], null);
+    }
+}
+
+export {
+    NamespaceSelect,
+    validateNamespace
+};
\ No newline at end of file
diff --git a/client/src/lib/tree.js b/client/src/lib/tree.js
index edfbe497..bf68d921 100644
--- a/client/src/lib/tree.js
+++ b/client/src/lib/tree.js
@@ -149,14 +149,14 @@ class TreeTable extends Component {
     updateSelection() {
         const tree = this.tree;
         if (this.selectMode === TreeSelectMode.MULTI) {
-            const selectSet = new Set(this.props.selection);
+            const selectSet = new Set(this.props.selection.map(key => this.stringifyKey(key)));
 
             tree.enableUpdate(false);
             tree.visit(node => node.setSelected(selectSet.has(node.key)));
             tree.enableUpdate(true);
 
         } else if (this.selectMode === TreeSelectMode.SINGLE) {
-            this.tree.activateKey(this.props.selection);
+            this.tree.activateKey(this.stringifyKey(this.props.selection));
         }
     }
 
@@ -167,9 +167,26 @@ class TreeTable extends Component {
         }
     }
 
+    stringifyKey(key) {
+        if (key !== null && key !== undefined) {
+            return key.toString();
+        } else {
+            return key;
+        }
+    }
+
+    destringifyKey(key) {
+        if (/^(\-|\+)?([0-9]+|Infinity)$/.test(key)) {
+            return Number(key);
+        } else {
+            return key;
+        }
+    }
+
     // Single-select
     onActivate(event, data) {
-        const selection = this.tree.getActiveNode().key;
+        const selection = this.destringifyKey(this.tree.getActiveNode().key);
+
         if (selection !== this.props.selection) {
             this.onSelectionChanged(selection);
         }
@@ -177,7 +194,7 @@ class TreeTable extends Component {
 
     // Multi-select
     onSelect(event, data) {
-        const newSel = this.tree.getSelectedNodes().map(node => node.key).sort();
+        const newSel = this.tree.getSelectedNodes().map(node => this.destringifyKey(node.key)).sort();
         const oldSel = this.props.selection;
 
         let updated = false;
diff --git a/client/src/namespaces/CUD.js b/client/src/namespaces/CUD.js
index bd7277a4..00802dba 100644
--- a/client/src/namespaces/CUD.js
+++ b/client/src/namespaces/CUD.js
@@ -81,9 +81,7 @@ export default class CUD extends Component {
 
     @withAsyncErrorHandler
     async loadFormValues() {
-        await this.getFormValuesFromURL(`/rest/namespaces/${this.state.entityId}`, data => {
-            if (data.parent) data.parent = data.parent.toString();
-        });
+        await this.getFormValuesFromURL(`/rest/namespaces/${this.state.entityId}`);
     }
 
     componentDidMount() {
@@ -93,7 +91,7 @@ export default class CUD extends Component {
             this.populateFormValues({
                 name: '',
                 description: '',
-                parent: null
+                namespace: null
             });
         }
 
@@ -112,10 +110,10 @@ export default class CUD extends Component {
         }
 
         if (!this.isEditGlobal()) {
-            if (!state.getIn(['parent', 'value'])) {
-                state.setIn(['parent', 'error'], t('Parent Namespace must be selected'));
+            if (!state.getIn(['namespace', 'value'])) {
+                state.setIn(['namespace', 'error'], t('Parent Namespace must be selected'));
             } else {
-                state.setIn(['parent', 'error'], null);
+                state.setIn(['namespace', 'error'], null);
             }
         }
     }
@@ -137,9 +135,7 @@ export default class CUD extends Component {
             this.disableForm();
             this.setFormStatusMessage('info', t('Saving namespace ...'));
 
-            const submitSuccessful = await this.validateAndSendFormValuesToURL(sendMethod, url, data => {
-                if (data.parent) data.parent = parseInt(data.parent);
-            });
+            const submitSuccessful = await this.validateAndSendFormValuesToURL(sendMethod, url);
 
             if (submitSuccessful) {
                 this.navigateToWithFlashMessage('/namespaces', 'success', t('Namespace saved'));
@@ -232,7 +228,7 @@ export default class CUD extends Component {
                     <TextArea id="description" label={t('Description')}/>
 
                     {!this.isEditGlobal() &&
-                    <TreeTableSelect id="parent" label={t('Parent Namespace')} data={this.state.treeData}/>}
+                    <TreeTableSelect id="namespace" label={t('Parent Namespace')} data={this.state.treeData}/>}
 
                     <ButtonRow>
                         <Button type="submit" className="btn-primary" icon="ok" label={t('Save')}/>
diff --git a/client/src/reports/CUD.js b/client/src/reports/CUD.js
index cc77327b..eea2e16f 100644
--- a/client/src/reports/CUD.js
+++ b/client/src/reports/CUD.js
@@ -12,6 +12,7 @@ import axios from '../lib/axios';
 import { withErrorHandling, withAsyncErrorHandler } from '../lib/error-handling';
 import { ModalDialog } from '../lib/bootstrap-components';
 import moment from 'moment';
+import { validateNamespace, NamespaceSelect } from '../lib/namespace';
 
 @translate()
 @withForm
@@ -76,6 +77,7 @@ export default class CUD extends Component {
                 name: '',
                 description: '',
                 report_template: null,
+                namespace: null,
                 user_fields: null
             });
         }
@@ -122,6 +124,8 @@ export default class CUD extends Component {
                 }
             }
         }
+
+        validateNamespace(t, state);
     }
 
     async submitHandler() {
@@ -191,7 +195,7 @@ export default class CUD extends Component {
         const t = this.props.t;
         const edit = this.props.edit;
 
-        const columns = [
+        const reportTemplateColumns = [
             { data: 0, title: "#" },
             { data: 1, title: t('Name') },
             { data: 2, title: t('Description') },
@@ -258,7 +262,9 @@ export default class CUD extends Component {
                     <InputField id="name" label={t('Name')}/>
                     <TextArea id="description" label={t('Description')} help={t('HTML is allowed')}/>
 
-                    <TableSelect id="report_template" label={t('Report Template')} withHeader dropdown dataUrl="/rest/report-templates-table" columns={columns} selectionLabelIndex={1}/>
+                    <TableSelect id="report_template" label={t('Report Template')} withHeader dropdown dataUrl="/rest/report-templates-table" columns={reportTemplateColumns} selectionLabelIndex={1}/>
+
+                    <NamespaceSelect/>
 
                     {userFieldsSpec ?
                         userFields.length > 0 &&
diff --git a/client/src/reports/List.js b/client/src/reports/List.js
index f758edb6..685c2ca6 100644
--- a/client/src/reports/List.js
+++ b/client/src/reports/List.js
@@ -32,9 +32,9 @@ export default class List extends Component {
         const actions = data => {
             let view, startStop, refreshTimeout;
 
-            const state = data[5];
+            const state = data[6];
             const id = data[0];
-            const mimeType = data[6];
+            const mimeType = data[7];
             
             if (state === ReportState.PROCESSING || state === ReportState.SCHEDULED) {
                 view = {
@@ -98,7 +98,8 @@ export default class List extends Component {
             { data: 1, title: t('Name') },
             { data: 2, title: t('Template') },
             { data: 3, title: t('Description') },
-            { data: 4, title: t('Created'), render: data => data ? moment(data).fromNow() : '' }
+            { data: 4, title: t('Created'), render: data => data ? moment(data).fromNow() : '' },
+            { data: 5, title: t('Namespace') }
         ];
 
         return (
diff --git a/client/src/reports/templates/CUD.js b/client/src/reports/templates/CUD.js
index 7f197286..8c6579dc 100644
--- a/client/src/reports/templates/CUD.js
+++ b/client/src/reports/templates/CUD.js
@@ -8,6 +8,7 @@ import { withForm, Form, FormSendMethod, InputField, TextArea, Dropdown, ACEEdit
 import axios from '../../lib/axios';
 import { withErrorHandling, withAsyncErrorHandler } from '../../lib/error-handling';
 import { ModalDialog } from '../../lib/bootstrap-components';
+import { validateNamespace, NamespaceSelect } from '../../lib/namespace';
 
 @translate()
 @withForm
@@ -50,6 +51,7 @@ export default class CUD extends Component {
                 this.populateFormValues({
                     name: '',
                     description: 'Generates a campaign report listing all subscribers along with their statistics.',
+                    namespace: null,
                     mime_type: 'text/html',
                     user_fields:
                         '[\n' +
@@ -99,6 +101,7 @@ export default class CUD extends Component {
                 this.populateFormValues({
                     name: '',
                     description: 'Generates a campaign report with results are aggregated by some "Country" custom field.',
+                    namespace: null,
                     mime_type: 'text/html',
                     user_fields:
                         '[\n' +
@@ -169,6 +172,7 @@ export default class CUD extends Component {
                 this.populateFormValues({
                     name: '',
                     description: 'Exports a list as a CSV file.',
+                    namespace: null,
                     mime_type: 'text/csv',
                     user_fields:
                         '[\n' +
@@ -193,6 +197,7 @@ export default class CUD extends Component {
                 this.populateFormValues({
                     name: '',
                     description: '',
+                    namespace: null,
                     mime_type: 'text/html',
                     user_fields: '',
                     js: '',
@@ -226,6 +231,8 @@ export default class CUD extends Component {
                 state.setIn(['user_fields', 'error'], t('Syntax error in the user fields specification'));
             }
         }
+
+        validateNamespace(t, state);
     }
 
     async submitAndStay() {
@@ -310,6 +317,7 @@ export default class CUD extends Component {
                     <InputField id="name" label={t('Name')}/>
                     <TextArea id="description" label={t('Description')} help={t('HTML is allowed')}/>
                     <Dropdown id="mime_type" label={t('Type')} options={[{key: 'text/html', label: t('HTML')}, {key: 'text/csv', label: t('CSV')}]}/>
+                    <NamespaceSelect/>
                     <ACEEditor id="user_fields" height="250px" mode="json" label={t('User selectable fields')} help={t('JSON specification of user selectable fields.')}/>
                     <ACEEditor id="js" height="700px" mode="javascript" label={t('Data processing code')} help={<Trans>Write the body of the JavaScript function with signature <code>function(inputs, callback)</code> that returns an object to be rendered by the Handlebars template below.</Trans>}/>
                     <ACEEditor id="hbs" height="700px" mode="handlebars" label={t('Rendering template')} help={<Trans>Use HTML with Handlebars syntax. See documentation <a href="http://handlebarsjs.com/">here</a>.</Trans>}/>
diff --git a/client/src/reports/templates/List.js b/client/src/reports/templates/List.js
index edf9e091..2137e0e5 100644
--- a/client/src/reports/templates/List.js
+++ b/client/src/reports/templates/List.js
@@ -33,7 +33,8 @@ export default class List extends Component {
             { data: 0, title: "#" },
             { data: 1, title: t('Name') },
             { data: 2, title: t('Description') },
-            { data: 3, title: t('Created'), render: data => moment(data).fromNow() }
+            { data: 3, title: t('Created'), render: data => moment(data).fromNow() },
+            { data: 4, title: t('Namespace') }
         ];
 
         return (
diff --git a/client/src/users/CUD.js b/client/src/users/CUD.js
index 429811f3..b614167f 100644
--- a/client/src/users/CUD.js
+++ b/client/src/users/CUD.js
@@ -4,7 +4,7 @@ import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import { translate } from 'react-i18next';
 import { requiresAuthenticatedUser, withPageHelpers, Title } from '../lib/page';
-import { withForm, Form, FormSendMethod, InputField, ButtonRow, Button } from '../lib/form';
+import { withForm, Form, FormSendMethod, InputField, ButtonRow, Button, TreeTableSelect } from '../lib/form';
 import axios from '../lib/axios';
 import { withErrorHandling, withAsyncErrorHandler } from '../lib/error-handling';
 import interoperableErrors from '../../../shared/interoperable-errors';
@@ -12,6 +12,7 @@ import passwordValidator from '../../../shared/password-validator';
 import validators from '../../../shared/validators';
 import { ModalDialog } from '../lib/bootstrap-components';
 import mailtrainConfig from 'mailtrainConfig';
+import { validateNamespace, NamespaceSelect } from '../lib/namespace';
 
 @translate()
 @withForm
@@ -64,7 +65,8 @@ export default class CUD extends Component {
                 name: '',
                 email: '',
                 password: '',
-                password2: ''
+                password2: '',
+                namespace: null
             });
         }
     }
@@ -129,6 +131,8 @@ export default class CUD extends Component {
 
         state.setIn(['password', 'error'], passwordMsgs.length > 0 ? passwordMsgs : null);
         state.setIn(['password2', 'error'], password !== password2 ? t('Passwords must match') : null);
+
+        validateNamespace(t, state);
     }
 
     async submitHandler() {
@@ -229,6 +233,7 @@ export default class CUD extends Component {
                     <InputField id="email" label={t('Email')}/>
                     <InputField id="password" label={t('Password')} type="password" />
                     <InputField id="password2" label={t('Repeat Password')} type="password" />
+                    <NamespaceSelect/>
 
                     <ButtonRow>
                         <Button type="submit" className="btn-primary" icon="ok" label={t('Save')}/>
diff --git a/client/src/users/List.js b/client/src/users/List.js
index 2ff3aa41..d60627b1 100644
--- a/client/src/users/List.js
+++ b/client/src/users/List.js
@@ -35,6 +35,8 @@ export default class List extends Component {
             ];
         }
 
+        columns.push({ data: 3, title: "Namespace" });
+
         return (
             <div>
                 <Toolbar>
diff --git a/lib/namespace-helpers.js b/lib/namespace-helpers.js
new file mode 100644
index 00000000..11233c8e
--- /dev/null
+++ b/lib/namespace-helpers.js
@@ -0,0 +1,16 @@
+'use strict';
+
+const knex = require('./knex');
+const { enforce } = require('./helpers');
+const interoperableErrors = require('../shared/interoperable-errors');
+
+async function validateEntity(tx, entity) {
+    enforce(entity.namespace, 'Entity namespace not set');
+    if (!await tx('namespaces').where('id', entity.namespace).first()) {
+        throw new interoperableErrors.DependencyNotFoundError();
+    }
+}
+
+module.exports = {
+    validateEntity
+};
\ No newline at end of file
diff --git a/models/namespaces.js b/models/namespaces.js
index 86809805..ed0cde04 100644
--- a/models/namespaces.js
+++ b/models/namespaces.js
@@ -5,7 +5,7 @@ const hasher = require('node-object-hash')();
 const { enforce, filterObject } = require('../lib/helpers');
 const interoperableErrors = require('../shared/interoperable-errors');
 
-const allowedKeys = new Set(['name', 'description', 'parent']);
+const allowedKeys = new Set(['name', 'description', 'namespace']);
 
 async function list() {
     return await knex('namespaces');
@@ -28,8 +28,8 @@ async function create(entity) {
     await knex.transaction(async tx => {
         const id = await tx('namespaces').insert(filterObject(entity, allowedKeys));
 
-        if (entity.parent) {
-            if (!await tx('namespaces').select(['id']).where('id', entity.parent).first()) {
+        if (entity.namespace) {
+            if (!await tx('namespaces').select(['id']).where('id', entity.namespace).first()) {
                 throw new interoperableErrors.DependencyNotFoundError();
             }
         }
@@ -39,7 +39,7 @@ async function create(entity) {
 }
 
 async function updateWithConsistencyCheck(entity) {
-    enforce(entity.id !== 1 || entity.parent === null, 'Cannot assign a parent to the root namespace.');
+    enforce(entity.id !== 1 || entity.namespace === null, 'Cannot assign a parent to the root namespace.');
 
     await knex.transaction(async tx => {
         const existing = await tx('namespaces').where('id', entity.id).first();
@@ -53,8 +53,8 @@ async function updateWithConsistencyCheck(entity) {
         }
 
         let iter = entity;
-        while (iter.parent != null) {
-            iter = await tx('namespaces').where('id', iter.parent).first();
+        while (iter.namespace != null) {
+            iter = await tx('namespaces').where('id', iter.namespace).first();
 
             if (!iter) {
                 throw new interoperableErrors.DependencyNotFoundError();
@@ -73,7 +73,7 @@ async function remove(id) {
     enforce(id !== 1, 'Cannot delete the root namespace.');
 
     await knex.transaction(async tx => {
-        const childNs = await tx('namespaces').where('parent', id).first();
+        const childNs = await tx('namespaces').where('namespace', id).first();
         if (childNs) {
             throw new interoperableErrors.ChildDetectedError();
         }
diff --git a/models/report-templates.js b/models/report-templates.js
index 897346ad..637d0ac9 100644
--- a/models/report-templates.js
+++ b/models/report-templates.js
@@ -5,8 +5,9 @@ const hasher = require('node-object-hash')();
 const { enforce, filterObject } = require('../lib/helpers');
 const dtHelpers = require('../lib/dt-helpers');
 const interoperableErrors = require('../shared/interoperable-errors');
+const namespaceHelpers = require('../lib/namespace-helpers');
 
-const allowedKeys = new Set(['name', 'description', 'mime_type', 'user_fields', 'js', 'hbs']);
+const allowedKeys = new Set(['name', 'description', 'mime_type', 'user_fields', 'js', 'hbs', 'namespace']);
 
 function hash(entity) {
     return hasher.hash(filterObject(entity, allowedKeys));
@@ -22,27 +23,36 @@ async function getById(id) {
 }
 
 async function listDTAjax(params) {
-    return await dtHelpers.ajaxList(params, tx => tx('report_templates'), ['report_templates.id', 'report_templates.name', 'report_templates.description', 'report_templates.created']);
+    return await dtHelpers.ajaxList(
+        params,
+        tx => tx('report_templates').innerJoin('namespaces', 'namespaces.id', 'report_templates.namespace'),
+        ['report_templates.id', 'report_templates.name', 'report_templates.description', 'report_templates.created', 'namespaces.name']
+    );
 }
 
 async function create(entity) {
-    const id = await knex('report_templates').insert(filterObject(entity, allowedKeys));
-    return id;
+    await knex.transaction(async tx => {
+        await namespaceHelpers.validateEntity(tx, entity);
+        const id = await tx('report_templates').insert(filterObject(entity, allowedKeys));
+        return id;
+    });
 }
 
-async function updateWithConsistencyCheck(template) {
+async function updateWithConsistencyCheck(entity) {
     await knex.transaction(async tx => {
-        const existing = await tx('report_templates').where('id', template.id).first();
-        if (!template) {
+        const existing = await tx('report_templates').where('id', entity.id).first();
+        if (!entity) {
             throw new interoperableErrors.NotFoundError();
         }
 
         const existingHash = hash(existing);
-        if (existingHash != template.originalHash) {
+        if (existingHash != entity.originalHash) {
             throw new interoperableErrors.ChangedError();
         }
 
-        await tx('report_templates').where('id', template.id).update(filterObject(template, allowedKeys));
+        await namespaceHelpers.validateEntity(tx, entity);
+
+        await tx('report_templates').where('id', entity.id).update(filterObject(entity, allowedKeys));
     });
 }
 
diff --git a/models/reports.js b/models/reports.js
index 630cbb8b..30daf820 100644
--- a/models/reports.js
+++ b/models/reports.js
@@ -6,10 +6,11 @@ const { enforce, filterObject } = require('../lib/helpers');
 const dtHelpers = require('../lib/dt-helpers');
 const interoperableErrors = require('../shared/interoperable-errors');
 const fields = require('./fields');
+const namespaceHelpers = require('../lib/namespace-helpers');
 
 const ReportState = require('../shared/reports').ReportState;
 
-const allowedKeys = new Set(['name', 'description', 'report_template', 'params']);
+const allowedKeys = new Set(['name', 'description', 'report_template', 'params', 'namespace']);
 
 
 function hash(entity) {
@@ -17,7 +18,12 @@ function hash(entity) {
 }
 
 async function getByIdWithTemplate(id) {
-    const entity = await knex('reports').where('reports.id', id).innerJoin('report_templates', 'reports.report_template', 'report_templates.id').select(['reports.id', 'reports.name', 'reports.description', 'reports.report_template', 'reports.params', 'reports.state', 'report_templates.user_fields', 'report_templates.mime_type', 'report_templates.hbs', 'report_templates.js']).first();
+    const entity = await knex('reports')
+        .where('reports.id', id)
+        .innerJoin('report_templates', 'reports.report_template', 'report_templates.id')
+        .select(['reports.id', 'reports.name', 'reports.description', 'reports.report_template', 'reports.params', 'reports.state', 'reports.namespace', 'report_templates.user_fields', 'report_templates.mime_type', 'report_templates.hbs', 'report_templates.js'])
+        .first();
+
     if (!entity) {
         throw new interoperableErrors.NotFoundError();
     }
@@ -29,12 +35,20 @@ async function getByIdWithTemplate(id) {
 }
 
 async function listDTAjax(params) {
-    return await dtHelpers.ajaxList(params, tx => tx('reports').innerJoin('report_templates', 'reports.report_template', 'report_templates.id'), ['reports.id', 'reports.name', 'report_templates.name', 'reports.description', 'reports.last_run', 'reports.state', 'report_templates.mime_type']);
+    return await dtHelpers.ajaxList(
+        params,
+        tx => tx('reports')
+            .innerJoin('report_templates', 'reports.report_template', 'report_templates.id')
+            .innerJoin('namespaces', 'namespaces.id', 'reports.namespace'),
+        ['reports.id', 'reports.name', 'report_templates.name', 'reports.description', 'reports.last_run', 'namespaces.name', 'reports.state', 'report_templates.mime_type']
+    );
 }
 
 async function create(entity) {
     let id;
     await knex.transaction(async tx => {
+        await namespaceHelpers.validateEntity(tx, entity);
+
         if (!await tx('report_templates').select(['id']).where('id', entity.report_template).first()) {
             throw new interoperableErrors.DependencyNotFoundError();
         }
@@ -67,6 +81,8 @@ async function updateWithConsistencyCheck(entity) {
             throw new interoperableErrors.DependencyNotFoundError();
         }
 
+        await namespaceHelpers.validateEntity(tx, entity);
+
         entity.params = JSON.stringify(entity.params);
 
         const filteredUpdates = filterObject(entity, allowedKeys);
diff --git a/models/users.js b/models/users.js
index aee96f2e..bb334c16 100644
--- a/models/users.js
+++ b/models/users.js
@@ -22,12 +22,16 @@ const bcryptCompare = bluebird.promisify(bcrypt.compare);
 const mailer = require('../lib/mailer');
 const mailerSendMail = bluebird.promisify(mailer.sendMail);
 
-const allowedKeys = new Set(['username', 'name', 'email', 'password']);
+const passport = require('../lib/passport');
+
+const namespaceHelpers = require('../lib/namespace-helpers');
+
+const allowedKeys = new Set(['username', 'name', 'email', 'password', 'namespace']);
 const allowedKeysExternal = new Set(['username']);
 const ownAccountAllowedKeys = new Set(['name', 'email', 'password']);
-const hashKeys = new Set(['username', 'name', 'email']);
+const hashKeys = new Set(['username', 'name', 'email', 'namespace']);
 
-const passport = require('../lib/passport');
+const defaultNamespace = 1;
 
 
 function hash(entity) {
@@ -35,7 +39,7 @@ function hash(entity) {
 }
 
 async function _getBy(key, value, extraColumns) {
-    const columns = ['id', 'username', 'name', 'email'];
+    const columns = ['id', 'username', 'name', 'email', 'namespace'];
 
     if (extraColumns) {
         columns.push(...extraColumns);
@@ -97,19 +101,24 @@ async function serverValidate(data, isOwnAccount) {
 }
 
 async function listDTAjax(params) {
-    return await dtHelpers.ajaxList(params, tx => tx('users'), ['users.id', 'users.username', 'users.name']);
+    return await dtHelpers.ajaxList(
+        params,
+        tx => tx('users').innerJoin('namespaces', 'namespaces.id', 'users.namespace'),
+        ['users.id', 'users.username', 'users.name', 'namespaces.name']
+    );
 }
 
 async function _validateAndPreprocess(tx, user, isCreate, isOwnAccount) {
     enforce(await tools.validateEmail(user.email) === 0, 'Invalid email');
 
+    await namespaceHelpers.validateEntity(tx, user);
+
     const otherUserWithSameEmailQuery = tx('users').where('email', user.email);
     if (user.id) {
         otherUserWithSameEmailQuery.andWhereNot('id', user.id);
     }
 
-    const otherUserWithSameUsername = await otherUserWithSameEmailQuery.first();
-    if (otherUserWithSameUsername) {
+    if (await otherUserWithSameEmailQuery.first()) {
         throw new interoperableErrors.DuplicitEmailError();
     }
 
@@ -122,8 +131,7 @@ async function _validateAndPreprocess(tx, user, isCreate, isOwnAccount) {
             otherUserWithSameUsernameQuery.andWhereNot('id', user.id);
         }
 
-        const otherUserWithSameUsername = await otherUserWithSameUsernameQuery.first();
-        if (otherUserWithSameUsername) {
+        if (await otherUserWithSameUsernameQuery.first()) {
             throw new interoperableErrors.DuplicitNameError();
         }
     }
@@ -157,7 +165,10 @@ async function create(user) {
 async function createExternal(user) {
     enforce(!passport.isAuthMethodLocal, 'External user management is required');
 
-    const userId = await knex('users').insert(filterObject(user, allowedKeysExternal));
+    const filteredUser = filterObject(user, allowedKeysExternal);
+    filteredUser.namespace = defaultNamespace;
+
+    const userId = await knex('users').insert(filteredUser);
     return userId;
 }
 
@@ -167,7 +178,7 @@ async function updateWithConsistencyCheck(user, isOwnAccount) {
     await knex.transaction(async tx => {
         await _validateAndPreprocess(tx, user, false, isOwnAccount);
 
-        const existingUser = await tx('users').select(['id', 'username', 'name', 'email', 'password']).where('id', user.id).first();
+        const existingUser = await tx('users').where('id', user.id).first();
         if (!user) {
             throw new interoperableErrors.NotFoundError();
         }
diff --git a/routes/rest/namespaces.js b/routes/rest/namespaces.js
index 5e28c240..50d34422 100644
--- a/routes/rest/namespaces.js
+++ b/routes/rest/namespaces.js
@@ -49,14 +49,14 @@ router.getAsync('/namespaces-tree', passport.loggedIn, async (req, res) => {
             entry = entries[row.id];
         }
 
-        if (row.parent) {
-            if (!entries[row.parent]) {
-                entries[row.parent] = {
+        if (row.namespace) {
+            if (!entries[row.namespace]) {
+                entries[row.namespace] = {
                     children: []
                 };
             }
 
-            entries[row.parent].children.push(entry);
+            entries[row.namespace].children.push(entry);
 
         } else {
             root = entry;
diff --git a/setup/knex/migrations/20170507083345_create_namespaces.js b/setup/knex/migrations/20170507083345_create_namespaces.js
index 38a4bc2a..4437a733 100644
--- a/setup/knex/migrations/20170507083345_create_namespaces.js
+++ b/setup/knex/migrations/20170507083345_create_namespaces.js
@@ -3,10 +3,7 @@ exports.up = function(knex, Promise) {
             table.increments('id').primary();
             table.string('name');
             table.text('description');
-            table.integer('parent').unsigned().references('namespaces.id').onDelete('CASCADE');
-        })
-        .table('lists', table => {
-            table.integer('namespace').unsigned().notNullable();
+            table.integer('namespace').unsigned().references('namespaces.id').onDelete('CASCADE');
         })
 
         .then(() => knex('namespaces').insert({
@@ -15,11 +12,43 @@ exports.up = function(knex, Promise) {
             description: 'Global namespace'
         }))
 
-        .then(() => knex('lists').update({
+        .then(() => knex.schema.table('users', table => {
+            table.integer('namespace').unsigned().notNullable();
+        }))
+        .then(() => knex('users').update({
             namespace: 1
         }))
+        .then(() => knex.schema.table('users', table => {
+            table.foreign('namespace').references('namespaces.id').onDelete('CASCADE');
+        }))
 
         .then(() => knex.schema.table('lists', table => {
+            table.integer('namespace').unsigned().notNullable();
+        }))
+        .then(() => knex('lists').update({
+            namespace: 1
+        }))
+        .then(() => knex.schema.table('lists', table => {
+            table.foreign('namespace').references('namespaces.id').onDelete('CASCADE');
+        }))
+
+        .then(() => knex.schema.table('report_templates', table => {
+            table.integer('namespace').unsigned().notNullable();
+        }))
+        .then(() => knex('report_templates').update({
+            namespace: 1
+        }))
+        .then(() => knex.schema.table('report_templates', table => {
+            table.foreign('namespace').references('namespaces.id').onDelete('CASCADE');
+        }))
+
+        .then(() => knex.schema.table('reports', table => {
+            table.integer('namespace').unsigned().notNullable();
+        }))
+        .then(() => knex('reports').update({
+            namespace: 1
+        }))
+        .then(() => knex.schema.table('reports', table => {
             table.foreign('namespace').references('namespaces.id').onDelete('CASCADE');
         }))