How To Fix 12821 - Disallowed session chosen in function module '&'

SAP Error Message - Details

• Message type: E = Error

• Message class: 12 - Herstelldatum/Mindesthaltbarkeitsdatum/Chargen

• Message number: 821

• Message text: Disallowed session chosen in function module '&'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 12821 - Disallowed session chosen in function module '&' ?

  The SAP error message 12821, which states "Disallowed session chosen in function module '&'", typically occurs when there is an attempt to use a session that is not permitted or is in an invalid state. This can happen in various scenarios, particularly when dealing with background processing or session management in SAP.
  Cause:
  
  Invalid Session: The session being referenced may have been closed or is not in a valid state for the operation being performed.
  Session Management: The function module may be trying to access a session that is not allowed due to system settings or user authorizations.
  Background Processing: If the function module is being called in a background job, it may not have access to certain sessions that are only available in the foreground.
  Configuration Issues: There may be configuration settings in the SAP system that restrict access to certain sessions.
  
  Solution:
  
  Check Session Status: Verify the status of the session being accessed. Ensure that it is open and valid for the operation you are trying to perform.
  Review Function Module: Look into the specific function module mentioned in the error message. Check its documentation and ensure that it is being used correctly.
  User Authorizations: Ensure that the user executing the function module has the necessary authorizations to access the session.
  Session Management Settings: Review the SAP system settings related to session management. This may involve checking transaction codes, user profiles, or system parameters.
  Debugging: If you have access to debugging tools, you can set breakpoints in the function module to trace the execution and identify where the error occurs.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional guidance.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the specific function module to understand its requirements and limitations.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found.
  Transaction Codes: Familiarize yourself with transaction codes related to session management, such as SM37 (for monitoring background jobs) and SM21 (for system logs).
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to your SAP Basis team or SAP support for further assistance.