IS-U Contract &1 is locked by user &2, benefit mass change not possible.

What causes this issue?

IS-U Contract &V1& is already locked by user&V2& and cannot be changed
in <DS><DS:TRAN./SAPCE/IUBENMASS>Benefit Mass Change </></> report.

System Response

Installation facts have not been changed for this <ZH>IS-U Contract</>.

How to fix this error?

Please, unlock benefit and run transaction again for only locked
contracts. List of locked entries could be displayed in transaction <DS>
<DS:TRAN.SM12>Select Locked Entries</></>.

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.