How To Fix SQ999 - Queue: Unknown return value

SAP Error Message - Details

• Message type: E = Error

• Message class: SQ - Queue Administration Transaction: Error Texts

• Message number: 999

• Message text: Queue: Unknown return value

What causes this issue?

Internal error in the queue control transaction.

System Response

Adjust PERFORM SEND_MSG.

How to fix this error?

Note the error and inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SQ999 - Queue: Unknown return value ?

  The SAP error message "SQ999 Queue: Unknown return value" typically occurs in the context of SAP's queue management system, particularly when dealing with asynchronous processing or background jobs. This error indicates that the system has encountered an unexpected return value from a queue operation, which can disrupt the normal processing flow.
  Causes:
  
  Queue Configuration Issues: There may be misconfigurations in the queue settings or parameters that lead to unexpected behavior.
  Data Inconsistencies: The data being processed may have inconsistencies or corruption that the queue cannot handle.
  System Bugs: There could be bugs in the SAP system or specific patches that have not been applied, leading to unexpected return values.
  Network Issues: If the queue is dependent on external systems or services, network issues could lead to timeouts or unexpected responses.
  Authorization Problems: Insufficient permissions for the user or process trying to access the queue can lead to errors.
  
  Solutions:
  
  Check Queue Configuration: Review the configuration settings for the queue in question. Ensure that all parameters are set correctly and that the queue is properly defined.
  Analyze Logs: Look at the application logs (transaction SLG1) and system logs (transaction SM21) for more detailed error messages that can provide context for the issue.
  Data Validation: Validate the data being processed to ensure there are no inconsistencies or corruption. This may involve checking the source data or the data being sent to the queue.
  Apply Patches: Ensure that your SAP system is up to date with the latest patches and updates. Check SAP Notes for any known issues related to the error.
  Network Check: If the queue interacts with external systems, verify that there are no network issues affecting communication.
  User Authorizations: Check the authorizations of the user or process that is trying to access the queue. Ensure they have the necessary permissions.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SMQ1 (for outbound queues) and SMQ2 (for inbound queues) to monitor and manage queues.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the problem persists after trying the above solutions, it may be necessary to contact SAP support for further assistance.