How To Fix WS035 - Missing parameters in FM & (internal error)

SAP Error Message - Details

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 035

• Message text: Missing parameters in FM & (internal error)

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• What is the cause and solution for SAP error message WS035 - Missing parameters in FM & (internal error) ?

  SAP Error Message:
  
  WS035 Missing parameters in FM & (internal error)
  
  Cause
  This error occurs when a Function Module (FM) is called without passing all the required parameters. The system expects certain importing, exporting, or changing parameters to be provided during the FM call, but some are missing or not properly supplied. This leads to an internal error because the FM cannot execute correctly without the necessary data.
  Common scenarios causing this error include:
  
  Calling a standard or custom FM without all mandatory parameters.
  Incorrect interface definition or mismatch between the FM call and the FM signature.
  Program or user-exit/enhancement code passing incomplete parameter lists.
  Issues in generated code or wrappers that call FMs dynamically without proper parameter handling.
  
  
  Solution
  
  
  Check the FM Call:
  
  Review the ABAP code where the FM is called.
  Ensure all required parameters (importing, exporting, changing) are passed.
  Verify the parameter names and types match the FM interface exactly.
  
  
  
  Check FM Interface:
  
  Use transaction SE37 to display the FM.
  Confirm which parameters are mandatory.
  Check if any parameters have default values or are optional.
  
  
  
  Debugging:
  
  Set a breakpoint at the FM call.
  Run the program and check the actual parameters passed.
  Identify which parameter(s) are missing or incorrectly passed.
  
  
  
  Check for Enhancements/User-Exits:
  
  Sometimes, enhancements or user-exits call FMs incorrectly.
  Review any custom code or enhancements related to the FM.
  
  
  
  Review Dynamic Calls:
  
  If the FM is called dynamically (e.g., via CALL FUNCTION with dynamic names or parameter lists), ensure the parameter table is correctly populated.
  
  
  
  SAP Notes and Patches:
  
  Search SAP Support Portal for notes related to WS035 and the specific FM.
  Apply any relevant patches or corrections.
  
  
  
  
  Related Information
  
  Transaction SE37: To check FM interface and test the FM.
  Debugging Tools: Use ABAP debugger to inspect parameter passing.
  SAP Help: SAP documentation on Function Modules and parameter passing.
  Common SAP Notes: Sometimes this error is linked to specific SAP releases or patches.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WS035 Missing parameters in FM & (internal error)
  
  
  Cause
  FM called without all required parameters
  
  
  Solution
  Verify and correct FM call to include all mandatory parameters; debug and check FM interface
  
  
  Tools
  SE37 (Function Builder), ABAP Debugger
  
  
  Additional
  Check for custom code/enhancements; consult SAP Notes if issue persists
  
  
  
  
  If you provide the name of the Function Module or the context in which this error occurs, I can help you with more specific guidance.