diff --git a/roles/0-init/tasks/validate_vars.yml b/roles/0-init/tasks/validate_vars.yml
index 4e117a7e8..b115afdc4 100644
--- a/roles/0-init/tasks/validate_vars.yml
+++ b/roles/0-init/tasks/validate_vars.yml
@@ -125,3 +125,10 @@
     quiet: yes
   loop: "{{ vars_checklist }}"
   #register: var_pairs_validation
+
+- name: 'DISALLOW "XYZ_install: False" WITH "XYZ_installed: True" ...for all {{ vars_checklist | length }} var pairs'
+  assert:
+    that: "{{ item }}_install or {{ item }}_installed is undefined"
+    fail_msg: "{{ item }} already installed please set to True in: /etc/iiab/local_vars.yml"
+    quiet: yes
+  loop: "{{ vars_checklist }}"