What causes this issue?

Because of the change of the masterdata the integration to the
Org.Management is changed.

System Response

The selected user operation is not executed.

How to fix this error?

Please check the organizational assignment and select the user operation
again.

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.