This article explains a known limitation in CA Identity Manager where configuring a "Dropdown Combo" style attribute above dependent attributes causes auto-population scripts to fail. To ensure JavaScript-based auto-population functions correctly, the control attribute must be placed appropriately within the screen configuration.
Identity Manager 14.5
In Identity Manager, form attributes are initialized based on their order in the screen definition. If a dependent attribute is initialized before the trigger attribute (the dropdown) has provided a value, the auto-population script cannot successfully reference the trigger attribute's selection.
Note: If using a shared Corporate and Provisioning store, ensure field references in the script are updated (e.g., eTTitle instead of Title).