Function type "Local GUI function" not allowed

What causes this issue?

You tried to assign function type P "Local GUI function" to a function.
This is currently only supported for tab titles in tabstrip controls.

System Response

The system cannot assign the function type.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.