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What causes this issue?

Dynamc Switching of a Profile Parameter

System Response

If the switch is successful, the new value is immediately active in the
system. If it is not possible to make a change, the input is rejected.

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

Caution:
The change is lost after the server has been restarted. To make this
change permanent, the change must be entered into a profile.

Error message extract from SAP system. Copyright SAP SE.