Disabled form fields are enabled when a user uses the "override" functionality in Service Catalog.

Document ID : KB000016669
Last Modified Date : 14/02/2018
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Question:

If a user uses the override functionality to modify a request, form fields which are set to "disabled" in the form editor can be editted.

Answer:

This is expected behaviour. The ability to edit a field which is disabled is part of the override functionality. It is intended for administrators to be able to modify request details as required, or to approve a request where they aren't assigned the request pending action.