Message type: E = Error
Message class:  HRPAY99RU_RMS_PL - Reporting management system: Processing layer message class 
Message number: 151
Message text: Another session exists in area &1 for report &2 in period &3 - &4
Current operation was terminated for a requested Reporting Session due
to another existing Reporting Session for report type &V1&, reporting
area &V2& in period &V3& - &V4&.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Use <LS>Reporting Session Maintenance</> (transaction
<DS:TRAN.HR99RU_REPSE_MAINT>HR99RU_REPSE_MAINT</>) to check or modify
the status of the existing Reporting Session.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message HRPAY99RU_RMS_PL151 indicates that there is already an active session for a specific report in a given area and period. This typically occurs in the context of payroll processing or similar HR-related reports where concurrent processing is not allowed for the same report in the same period.
Cause: Concurrent Execution: The error is triggered when a user attempts to run a payroll report or transaction that is already being processed by another session. SAP restricts multiple sessions for the same report to prevent data inconsistencies. Long-Running Processes: If a previous session is taking longer than expected to complete, it may block new requests for the same report. User Error: Sometimes, users may inadvertently try to execute the same report multiple times.
Solution: Check Active Sessions: Use transaction code SM50 or SM66 to check for active processes. Look for the report in question and see if it is currently running. If you find an active
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