Message type: E = Error
Message class: AH - IS-U billing (master data)
Message number: 641
Message text: FM &1: parameter &2 is required
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AH641
- FM &1: parameter &2 is required ?The SAP error message AH641, which states "FM &1: parameter &2 is required," typically occurs when a function module (FM) is called without providing a required parameter. This error indicates that the function module expects a certain parameter to be passed to it, but it was not included in the call.
Cause: Missing Parameter: The most common cause is that the function module is being called without one or more required parameters. Incorrect Function Module Usage: The function module may be used incorrectly, either by misunderstanding its interface or by not adhering to the expected input/output parameters. Changes in Function Module: If the function module has been modified (e.g., by an upgrade or a custom development), the required parameters may have changed.
Solution: Check Function Module Documentation: Review the documentation for the function module to understand which parameters are required. You can do this by navigating to the function module in transaction SE37 or SE80 and
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