How To Fix /SAPAPO/DMRES504 - Internal error: Incorrect call-up of function module

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/DMRES -

• Message number: 504

• Message text: Internal error: Incorrect call-up of function module

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/DMRES504 - Internal error: Incorrect call-up of function module ?

  The SAP error message /SAPAPO/DMRES504 Internal error: Incorrect call-up of function module typically indicates that there is an issue with the way a function module is being called within the SAP Advanced Planning and Optimization (APO) system. This error can arise due to various reasons, including configuration issues, data inconsistencies, or problems with the function module itself.
  Possible Causes:
  
  Incorrect Function Module Call: The function module may be called with incorrect parameters or in an inappropriate context.
  Data Inconsistencies: There may be inconsistencies in the data being processed, such as missing or incorrect entries in the database.
  Configuration Issues: The APO system may not be configured correctly, leading to improper function module execution.
  System Bugs: There could be bugs in the SAP system or the specific version of the function module being used.
  Authorization Issues: The user executing the function may not have the necessary authorizations to perform the action.
  
  Solutions:
  
  Check Function Module Parameters: Review the parameters being passed to the function module to ensure they are correct and valid.
  Review Configuration: Verify the configuration settings in the APO system to ensure they are set up correctly.
  Data Validation: Check the relevant data in the system for inconsistencies or missing entries. This may involve looking at master data, transaction data, or configuration data.
  Debugging: If you have access to debugging tools, you can set breakpoints in the function module to analyze the flow and identify where the error occurs.
  Check SAP Notes: Look for any relevant SAP Notes that may address this specific error. SAP frequently releases notes that provide fixes or workarounds for known issues.
  System Update: Ensure that your SAP system is up to date with the latest patches and updates, as this may resolve known bugs.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including transaction codes, user actions, and any relevant logs.
  
  Related Information:
  
  Transaction Codes: You may want to check transaction codes related to APO, such as /SAPAPO/RES01 for resource planning or /SAPAPO/DMRES for demand management.
  Logs and Traces: Review system logs (SM21) and application logs (SLG1) for additional error messages or warnings that may provide more context.
  User Authorizations: Check the user roles and authorizations to ensure that the user has the necessary permissions to execute the function module.
  
  By following these steps, you should be able to diagnose and potentially resolve the /SAPAPO/DMRES504 error in your SAP system.