How To Fix /IWFND/CM_CNP026 - Unique-ID generation error

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_CNP -

• Message number: 026

• Message text: Unique-ID generation error

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_CNP026 - Unique-ID generation error ?

  The SAP error message /IWFND/CM_CNP026 Unique-ID generation error typically occurs in the context of SAP Gateway services, particularly when there is an issue with generating unique identifiers for entities in the OData service. This can happen for various reasons, including configuration issues, data inconsistencies, or problems with the underlying database.
  Causes:
  
  Database Issues: There may be problems with the database that prevent the generation of unique IDs, such as locks or constraints.
  Configuration Errors: Incorrect configuration in the OData service or the underlying data model can lead to this error.
  Concurrency Issues: If multiple requests are trying to generate unique IDs simultaneously, it may lead to conflicts.
  Data Model Issues: If the data model is not properly defined or if there are issues with the entity sets, it can cause this error.
  Service Activation: The OData service may not be properly activated or may have been deactivated.
  
  Solutions:
  
  Check Database Locks: Ensure that there are no locks on the database tables that are preventing ID generation. You can use transaction codes like SM12 to check for locks.
  Review Configuration: Verify the configuration of the OData service and ensure that all necessary settings are correctly defined.
  Check for Concurrency: If the error is related to concurrent requests, consider implementing a locking mechanism or queuing requests to avoid conflicts.
  Validate Data Model: Review the data model and ensure that all entity sets and relationships are correctly defined. Use transaction SE11 to check the data dictionary.
  Service Activation: Ensure that the OData service is activated. You can check this in the SAP Gateway Service Builder (transaction SEGW) or using transaction /IWFND/MAINT_SERVICE.
  Check Logs: Review the application logs for more detailed error messages. You can use transaction SLG1 to check the logs related to the OData service.
  Update SAP Notes: Check for any relevant SAP Notes that may address this issue. Sometimes, applying a patch or update can resolve underlying bugs.
  
  Related Information:
  
  SAP Gateway: Understanding how SAP Gateway works and its role in OData services can help in troubleshooting.
  OData Services: Familiarity with OData service concepts, including entity sets and unique identifiers, is beneficial.
  SAP Community: Engaging with the SAP Community or forums can provide insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve SAP support for further investigation.