How To Fix RSQU016 - There is a discrepancy between the confirmation and deletion of qRFC-LUWs

SAP Error Message - Details

• Message type: E = Error

• Message class: RSQU - S-API after 4.0: Delta Queue, Real Time Update

• Message number: 016

• Message text: There is a discrepancy between the confirmation and deletion of qRFC-LUWs

What causes this issue?

When data was confirmed and deleted in the qRFC queue, the system found
a discrepancy between the number of newly confirmed LUWs (&V1&) and the
number of LUWs to be deleted (&V2&).
Where more LUWs are to be deleted than were previously confirmed, a
previous delete attempt was terminated.
&SYSTEM_REPONSE&
The LUWs were confirmed but not completely deleted from the qRFC and
tRFC tables. The confirmation already ensures that the data is not
transferred into the BW again with a subsequent request.
Delta extraction was continued.

How to fix this error?

You do not need to do anything urgently.
If the message also arises during all subsequent delta requests,
contact SAP Support with the message number at hand. In this case,
there is a danger that the qRFC and tRFC tables run at full capacity,
which may also affect other applications.

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSQU016 - There is a discrepancy between the confirmation and deletion of qRFC-LUWs ?

  The SAP error message RSQU016 indicates that there is a discrepancy between the confirmation and deletion of qRFC (queued Remote Function Call) Logical Units of Work (LUWs). This typically occurs in scenarios where there are inconsistencies in the processing of queued messages, which can lead to issues in data consistency and integrity.
  Cause:
  
  Inconsistent State: The error usually arises when there is a mismatch between the status of the LUWs in the queue and the actual processing state. For example, if a LUW is confirmed but not deleted, or vice versa, it can lead to this error.
  Network Issues: Temporary network issues or interruptions during the processing of qRFC can cause discrepancies.
  System Errors: Bugs or errors in the SAP system or in the application logic that handles qRFC processing can also lead to this issue.
  Manual Interventions: Manual deletions or modifications of LUWs without proper handling can cause inconsistencies.
  
  Solution:
  
  Check qRFC Monitor: Use transaction code SMQ1 (for outbound queues) or SMQ2 (for inbound queues) to monitor the status of the LUWs. Look for any LUWs that are in an inconsistent state.
  Reprocess LUWs: If you find LUWs that are not processed correctly, you can try to reprocess them. This can often resolve the discrepancies.
  Delete Inconsistent LUWs: If certain LUWs are confirmed but not deleted, you may need to manually delete them. Be cautious with this approach, as it can lead to data loss if not handled properly.
  Check Logs: Review the application logs (transaction SLG1) for any related error messages that might provide more context on the issue.
  System Restart: In some cases, restarting the relevant application server or the entire SAP system can help clear up temporary inconsistencies.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error. SAP frequently releases updates and patches that can resolve known issues.
  
  Related Information:
  
  qRFC: It is a mechanism in SAP that allows for asynchronous communication between systems. It ensures that messages are processed in the order they are sent.
  LUW: A Logical Unit of Work is a sequence of operations that are treated as a single unit. In the context of qRFC, it refers to the messages that are queued for processing.
  Transaction Codes: Familiarize yourself with transaction codes like SMQ1, SMQ2, and SLG1 for monitoring and troubleshooting qRFC issues.
  SAP Basis Team: If the issue persists, it may be necessary to involve your SAP Basis team or SAP support for further investigation and resolution.
  
  By following these steps, you should be able to identify and resolve the discrepancies causing the RSQU016 error.