How To Fix /SAPAPO/OM_ERROR2128 - Transactional simulation already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_ERROR2 -

• Message number: 128

• Message text: Transactional simulation already exists

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/OM_ERROR2128 - Transactional simulation already exists ?

  The SAP error message /SAPAPO/OM_ERROR2128 indicates that a transactional simulation already exists in the system. This error typically occurs in the context of SAP Advanced Planning and Optimization (APO) when a user attempts to create a new simulation while another one is already active or has not been properly closed.
  Cause:
  
  Existing Simulation: The most common cause is that there is already an active simulation session in the system. This can happen if a previous simulation was not properly closed or if multiple users are trying to create simulations simultaneously.
  Session Management: The system may not have released the previous simulation due to a session management issue or a timeout.
  User Lock: Sometimes, a user lock may prevent the creation of a new simulation if the previous one is still considered active.
  
  Solution:
  
  
  Check Active Simulations: 
  
  Go to the relevant transaction in SAP APO (e.g., /SAPAPO/OM for order management) and check if there are any active simulations. If you find one, you may need to either complete or delete it.
  
  
  
  Close Existing Simulation: 
  
  If you have access, try to close the existing simulation. This can usually be done through the same transaction where the simulation was created.
  
  
  
  Session Cleanup: 
  
  If you cannot find any active simulations, it may be necessary to perform a session cleanup. This can sometimes be done by logging out and back into the system or by using transaction codes like SM12 to check for and delete any user locks.
  
  
  
  Consult with Basis Team: 
  
  If the issue persists, it may be necessary to consult with your SAP Basis team. They can check for any underlying issues in the system that may be causing the simulation to remain active.
  
  
  
  Review Documentation: 
  
  Check SAP Notes or documentation related to this error message for any specific patches or updates that may address the issue.
  
  
  
  Related Information:
  
  SAP Notes: Look for SAP Notes related to /SAPAPO/OM_ERROR2128 for any specific fixes or recommendations from SAP.
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP APO, such as /SAPAPO/OM for order management and /SAPAPO/SDP94 for demand planning, as they may help in managing simulations.
  User Permissions: Ensure that you have the necessary permissions to create and manage simulations in the system.
  
  By following these steps, you should be able to resolve the error and successfully create or manage your transactional simulations in SAP APO.