How To Fix /SAPAPO/ATP031 - Unidentified function &1 when calling up &2; programming error

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 031

• Message text: Unidentified function &1 when calling up &2; programming error

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ATP031 - Unidentified function &1 when calling up &2; programming error ?

  The SAP error message /SAPAPO/ATP031 indicates a programming error related to an unidentified function when calling up a specific function module or method in the Advanced Planning and Optimization (APO) module of SAP. This error typically arises when the system encounters a function that it cannot recognize or that is not properly defined in the context of the current operation.
  Cause:
  
  Missing Function Module: The function module or method being called may not exist in the system or may not be activated.
  Incorrect Configuration: There may be configuration issues in the APO system that prevent the function from being recognized.
  Transport Issues: If the function was recently transported from another system, it may not have been transported correctly.
  Version Mismatch: There could be a version mismatch between different components of the SAP system, leading to incompatibility.
  Custom Code Issues: If there are custom developments or enhancements, they may not be correctly implemented or may have errors.
  
  Solution:
  
  Check Function Module: Verify that the function module or method being called exists in the system. You can do this by using transaction SE37 (Function Builder) or SE80 (Object Navigator).
  Review Configuration: Ensure that all necessary configurations in the APO system are correctly set up. This may involve checking settings in transaction SPRO.
  Transport Logs: If the function was recently transported, check the transport logs for any errors or issues during the transport process.
  Debugging: Use the debugger to trace the execution of the program and identify where the error occurs. This can provide insights into what is going wrong.
  Check for Notes: Look for SAP Notes related to this error message. SAP frequently releases notes that address known issues and provide solutions or workarounds.
  Consult Documentation: Review the relevant SAP documentation for any specific requirements or prerequisites for the function being called.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP Support for assistance.
  
  Related Information:
  
  Transaction Codes: SE37 (Function Module), SE80 (Object Navigator), SPRO (Customizing).
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error.
  Debugging Tools: Familiarize yourself with debugging tools in SAP to help trace and resolve issues.
  Community Forums: Check SAP Community forums or other user groups for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution.