How To Fix SR321 - Inbound queue name & cannot be used for classic qRFC

SAP Error Message - Details

• Message type: E = Error

• Message class: SR - RFC utilities

• Message number: 321

• Message text: Inbound queue name & cannot be used for classic qRFC

What causes this issue?

When you called classic qRFC, you used an inbound queue name that cannot
be used with classic inbound qRFC. This queue name has been implemented
for bgRFC instead.

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?

Check whether this queue name is supposed to be used for classic inbound
qRFC or outbound bgRFC.
You can use entries in a Customizing table to specify whether a queue
name can be used for classic qRFC. Queue name prefixes are stored in
this Customizing table. Any queue names that match the prefixes in this
table are not permitted as queue names for classic qRFC.
In some circumstances you can delete the registration of the queue name
prefix in transaction SBGRFCCONF.
The queue name prefix can be deleted only if no more inbound bgRFC
queues exist with this prefix. Since this Customizing table is a
cross-client table, there can also be no queues with this prefix in any
other clients. You can use transaction SBGRFCMON to check this.

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 SR321 - Inbound queue name & cannot be used for classic qRFC ?

  The SAP error message SR321 indicates that the specified inbound queue name cannot be used for classic qRFC (queued Remote Function Call). This error typically arises in scenarios where there is an issue with the configuration of the qRFC or the inbound queue itself.
  Cause:
  
  Queue Configuration: The inbound queue may not be properly configured or may not exist in the system.
  Queue Type: The queue might be of a type that is not compatible with classic qRFC.
  Transport Layer Issues: There may be issues with the transport layer or the connection between systems.
  System Settings: The system settings for qRFC may not be correctly set up, leading to this error.
  Namespace Issues: The queue name might be using a namespace that is not allowed or recognized by the system.
  
  Solution:
  
  
  Check Queue Configuration:
  
  Verify that the inbound queue is correctly defined in the system. You can check this in transaction SMQ1 (for outbound queues) and SMQ2 (for inbound queues).
  Ensure that the queue name is correctly specified and follows the naming conventions.
  
  
  
  Queue Type Verification:
  
  Ensure that the queue type is compatible with classic qRFC. Classic qRFC typically requires specific configurations that may not be met by other types of queues.
  
  
  
  Review System Settings:
  
  Check the settings for qRFC in transaction SMQS to ensure that everything is configured correctly.
  Ensure that the qRFC settings are consistent across the systems involved in the communication.
  
  
  
  Check Transport Layer:
  
  If the error occurs during a transport operation, ensure that the transport layer is functioning correctly and that there are no connectivity issues between the systems.
  
  
  
  Namespace Validation:
  
  Ensure that the queue name does not use a restricted or invalid namespace. If necessary, rename the queue to comply with the naming conventions.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes that may address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  
  
  
  Testing:
  
  After making the necessary changes, test the configuration to ensure that the error is resolved.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SMQ1: Monitor outbound queues.
  SMQ2: Monitor inbound queues.
  SMQS: Monitor qRFC settings.
  
  
  
  Documentation: Refer to SAP Help documentation for detailed information on qRFC and its configuration.
  
  
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  
  If the problem persists after following these steps, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.