How To Fix /SAPAPO/CIF_NQRFC051 - Enqueue is not available

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/CIF_NQRFC -

• Message number: 051

• Message text: Enqueue is not available

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/CIF_NQRFC051 - Enqueue is not available ?

  The SAP error message /SAPAPO/CIF_NQRFC051 Enqueue is not available typically occurs in the context of the Core Interface (CIF) when there is an issue with the enqueue mechanism in the SAP system. This error indicates that the system is unable to acquire a lock on the necessary resources, which is essential for ensuring data consistency during the CIF process.
  Causes:
  
  Enqueue Server Issues: The enqueue server may be down or not functioning properly. This can happen due to system restarts, network issues, or configuration problems.
  Lock Table Overflow: The lock table may be full, preventing new locks from being acquired.
  System Configuration: Incorrect configuration of the CIF or the underlying SAP systems can lead to enqueue issues.
  Network Problems: If there are network connectivity issues between the systems involved in the CIF process, it can lead to enqueue failures.
  Resource Contention: High load on the system or contention for resources can lead to delays in acquiring locks.
  
  Solutions:
  
  Check Enqueue Server: Ensure that the enqueue server is running. You can check this in transaction SM51 (for instance, by looking at the status of the application servers).
  Monitor Lock Table: Use transaction SM12 to check for locks. If the lock table is full, you may need to release unnecessary locks or increase the size of the lock table in the system configuration.
  Review CIF Configuration: Verify the CIF configuration settings in both the SAP ERP and SAP APO systems to ensure they are correctly set up.
  Check System Logs: Look at the system logs (transaction SM21) for any related errors or warnings that might provide more context about the issue.
  Network Connectivity: Ensure that there are no network issues between the systems involved in the CIF process. You can use tools like ping or traceroute to check connectivity.
  Restart Services: If the enqueue server is not responding, consider restarting the relevant services or the entire system if necessary.
  Increase Lock Table Size: If the lock table is frequently full, consider increasing its size in the system profile parameters.
  
  Related Information:
  
  
  Transaction Codes:
  
  SM51: To check the status of application servers.
  SM12: To view and manage locks.
  SM21: To view system logs.
  CIF transaction codes for configuration and monitoring.
  
  
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps. You can search for notes related to CIF and enqueue issues in the SAP Support Portal.
  
  
  Documentation: Review the SAP documentation for CIF and enqueue mechanisms for a deeper understanding of how they work and best practices for configuration.
  
  
  If the issue persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.