How To Fix SDEST040 - Could not switch to classic qRFC version

SDEST040 - Overview

• Message type: E = Error

• Message class: SDEST - Messages for RFC Destinations

• Message number: 040

• Message text: Could not switch to classic qRFC version

What causes this issue?

Unprocessed queues exist for the destination &v1&. You cannot change the
qRFC version for this destination until all queues have been processed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Use the <DS:TRAN.SBGRFCMON>bgRFC Monitor</> to check the existing
queues. Remember that unprocessed queues may exist in other clients. You
can then specify that classic qRFC be used for destination &v1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDEST040 - Could not switch to classic qRFC version ?

  The SAP error message SDEST040: Could not switch to classic qRFC version typically occurs in the context of using the qRFC (queued Remote Function Call) mechanism in SAP systems. This error indicates that there is an issue with the configuration or the state of the qRFC environment.
  Causes:
  
  
  
  Configuration Issues: The qRFC settings may not be properly configured in the SAP system. This can include missing or incorrect settings in the transaction codes related to qRFC, such as SMQ1 (for outbound queues) and SMQ2 (for inbound queues).
  
  
  Queue State: The queues may be in an inconsistent state, possibly due to previous errors or interruptions in processing.
  
  
  Version Compatibility: There may be compatibility issues between the versions of the SAP system components or between the qRFC and the application that is trying to use it.
  
  
  Transport Layer Issues: If the error occurs during a transport operation, it may be related to issues in the transport layer