How To Fix /SAPAPO/OM_ERROR021 - Only use constants from /sapapo/constants ("Activity status")

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_ERROR -

• Message number: 021

• Message text: Only use constants from /sapapo/constants ("Activity status")

Self-Explanatory Message

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• What is the cause and solution for SAP error message /SAPAPO/OM_ERROR021 - Only use constants from /sapapo/constants ("Activity status") ?

  The SAP error message /SAPAPO/OM_ERROR021 indicates that there is an issue with the use of constants in the context of activity status within the SAP Advanced Planning and Optimization (APO) module. This error typically arises when a non-constant value is used where a predefined constant is expected.
  Cause:
  The error is triggered when:
  
  A user attempts to use a variable or a non-constant value in a field that requires a constant from the /SAPAPO/Constants table, specifically related to activity status.
  The system expects a specific set of predefined constants for activity statuses, and any deviation from these constants will result in this error.
  
  Solution:
  To resolve this error, follow these steps:
  
  
  Check the Input Values: Review the values being passed to the function or transaction that triggered the error. Ensure that only constants defined in the /SAPAPO/Constants table for activity status are being used.
  
  
  Use the Correct Constants: 
  
  Navigate to the /SAPAPO/Constants table in your SAP system.
  Identify the valid constants for activity status. These constants are typically predefined and should be used in your configuration or transaction.
  
  
  
  Modify the Code/Configuration: If you are working with custom code or configuration:
  
  Replace any non-constant values with the appropriate constants from the /SAPAPO/Constants table.
  Ensure that any logic that determines the activity status is correctly referencing these constants.
  
  
  
  Testing: After making the necessary changes, test the transaction or function again to ensure that the error is resolved.
  
  
  Related Information:
  
  Documentation: Refer to the SAP Help Portal or the specific documentation for the APO module to understand the context of activity statuses and the constants available.
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or updates related to this error message.
  Community Forums: Engage with SAP community forums or support channels for additional help or to see if others have encountered similar issues.
  
  By ensuring that only the predefined constants are used for activity statuses, you should be able to resolve the /SAPAPO/OM_ERROR021 error effectively.