User &1 may not substitute for user &1
Message type: E = Error
Message class: BC - Scheduler (calendar)
Message number: 158
Message text: User &1 may not substitute for user &1
What causes this issue?
You require a special authorization to change a group appointment that
you have not created yourself. You do not have this authorization.
System Response
The date is not changed.
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.
Error message extract from SAP system. Copyright SAP SE.