How To Fix SD_CDS_ENTITY021 - Session variable not valid or too many session variables

SAP Error Message - Details

• Message type: E = Error

• Message class: SD_CDS_ENTITY - Messages for STOBS/entities

• Message number: 021

• Message text: Session variable not valid or too many session variables

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SD_CDS_ENTITY021 - Session variable not valid or too many session variables ?

  The SAP error message SD_CDS_ENTITY021 typically indicates an issue with session variables in the context of Core Data Services (CDS) views, particularly when working with the SAP S/4HANA system. This error can occur when the session variable is either not valid or when there are too many session variables being used in a single query.
  Causes:
  
  Invalid Session Variable: The session variable being referenced may not be defined correctly or may not exist in the current context.
  Too Many Session Variables: The query may be attempting to use more session variables than the system can handle, leading to performance issues or exceeding limits set by the system.
  Context Issues: The session variable may not be accessible in the context where it is being used, possibly due to scope or lifecycle issues.
  Incorrect Data Type: The session variable may be of an incorrect data type or format that is not compatible with the expected input.
  
  Solutions:
  
  Check Session Variable Definition: Ensure that the session variable is correctly defined in the CDS view and that it is being referenced properly in your query.
  Reduce the Number of Session Variables: If you are using multiple session variables, try to minimize their usage. Consolidate logic where possible to reduce the number of variables.
  Review Context and Scope: Make sure that the session variable is being used in the correct context. Check if it is defined in the right scope and is accessible where you are trying to use it.
  Validate Data Types: Ensure that the session variable's data type matches the expected type in the CDS view. If necessary, perform type conversions.
  Debugging: Use debugging tools available in SAP to trace the execution of the CDS view and identify where the error is occurring. This can help pinpoint the exact issue with the session variable.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes or Knowledge Base Articles (KBAs) that may address this specific error or provide additional context.
  Documentation: Review the official SAP documentation on CDS views and session variables to understand their usage and limitations.
  Community Forums: Engage with the SAP Community or forums where other users may have encountered similar issues and can provide insights or solutions.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the context in which it occurs.