How To Fix DU201 - Interface for function module & could not be created

SAP Error Message - Details

• Message type: E = Error

• Message class: DU - Data transfer to SAP-EIS

• Message number: 201

• Message text: Interface for function module & could not be created

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DU201 - Interface for function module & could not be created ?

  The SAP error message DU201 indicates that there is an issue with the creation of an interface for a function module. This error typically arises during the development or modification of function modules in the ABAP environment. Here are some common causes, solutions, and related information for this error:
  Causes:
  
  Naming Conflicts: The function module name may conflict with existing objects or naming conventions in the system.
  Syntax Errors: There may be syntax errors in the function module code that prevent the interface from being generated.
  Missing Components: Required components or parameters for the function module may be missing or incorrectly defined.
  Transport Issues: If the function module is being transported from one system to another, there may be issues with the transport request.
  Authorization Issues: The user may not have the necessary authorizations to create or modify function modules.
  
  Solutions:
  
  Check Naming Conventions: Ensure that the function module name adheres to SAP naming conventions and does not conflict with existing objects.
  Review Code for Errors: Go through the function module code to identify and correct any syntax errors or missing components.
  Recreate the Interface: If the interface is corrupted, try to delete and recreate it. This can sometimes resolve the issue.
  Check Transport Requests: If the function module is being transported, ensure that the transport request is correctly configured and that all dependencies are included.
  Verify Authorizations: Ensure that the user has the necessary authorizations to create or modify function modules. You may need to consult with your SAP security team.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE37 (Function Builder) to check the function module and its interface.
  SAP Notes: Check SAP Notes for any known issues related to this error message. SAP frequently updates its knowledge base with solutions to common problems.
  Debugging: If the error persists, consider using debugging tools to trace the execution and identify where the error occurs.
  System Logs: Review system logs (transaction SM21) for any additional error messages or warnings that may provide more context.
  
  If the issue continues after trying the above solutions, it may be beneficial to consult with an SAP Basis or ABAP developer for further assistance.