Mocking of SSCUI settings not allowed <<see long text>>

What causes this issue?

Mocking of SSCUI settings are only allowed when the calling program is
SSCUI test report or the call is within the unit test environment

System Response

Object instantiation failed

How to fix this error?

Test the application using unit test or use the SSCUI test report to
simulate the maintenance UI

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.