How To Fix WVLB001 - FM &1 called with wrong or missing input parameter values

SAP Error Message - Details

• Message type: E = Error

• Message class: WVLB - Messages for Load Building

• Message number: 001

• Message text: FM &1 called with wrong or missing input parameter values

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 WVLB001 - FM &1 called with wrong or missing input parameter values ?

  The SAP error message WVLB001 indicates that a function module (FM) was called with incorrect or missing input parameter values. This error typically arises when the parameters expected by the function module do not match the values being passed to it, either due to incorrect data types, missing parameters, or incorrect sequence of parameters.
  Causes:
  
  Missing Parameters: One or more required input parameters are not being passed to the function module.
  Incorrect Data Types: The data types of the parameters being passed do not match the expected data types defined in the function module.
  Incorrect Sequence: The parameters are being passed in the wrong order, which can lead to confusion in the function module.
  Custom Code Issues: If the function module is being called from custom ABAP code, there may be logical errors in the code that lead to incorrect parameter values.
  Changes in Function Module: If the function module has been modified (e.g., new parameters added), the calling program may not have been updated accordingly.
  
  Solutions:
  
  Check Function Module Documentation: Review the documentation for the function module to understand the required input parameters and their expected data types.
  Validate Input Parameters: Ensure that all required parameters are being passed and that they are of the correct data type.
  Debugging: Use the ABAP debugger to step through the code and inspect the values being passed to the function module. This can help identify any discrepancies.
  Update Custom Code: If the function module has changed, update any custom code that calls it to ensure it aligns with the new parameter requirements.
  Error Handling: Implement error handling in your code to catch and manage such errors gracefully, providing meaningful messages to users.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE37 (Function Builder) to view the function module and its parameters.
  SAP Notes: Check for any relevant SAP Notes that might address known issues with the function module or provide additional guidance.
  Community Forums: SAP Community and other forums can be useful for finding similar issues faced by other users and their solutions.
  
  By following these steps, you should be able to identify the cause of the WVLB001 error and implement a solution to resolve it.