How To Fix SQ999 - Queue: Unknown return value

SQ999 - Overview

• 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