How To Fix WA651 - Receiver function module &: Error determining interface

WA651 - Overview

• Message type: E = Error

• Message class: WA - Messages from Workflow Event Manager

• Message number: 651

• Message text: Receiver function module &: Error determining interface

What causes this issue?

An error occurred when determining the interface of the specified
receiver function module which could not be identified.

System Response

The action was terminated, an event was not triggered.

How to fix this error?

Check the definition of the specified receiver function module.

Error message extract from SAP system. Copyright SAP SE.

WA651 - Details

• The SAP error message:
  WA651 Receiver function module &: Error determining interface
  typically occurs in the context of ALE/IDoc processing or RFC communication, where the system is unable to determine the correct interface for the receiver function module during message processing.
  
  Cause
  
  The error indicates that SAP cannot find or determine the appropriate interface for the receiver function module specified in the IDoc or ALE message processing.
  This usually happens because:
  The function module assigned to the receiver is not properly configured or does not exist.
  The partner profile or distribution model is incomplete or incorrect.
  The interface determination logic (e.g., in the distribution model or partner profiles) is missing or inconsistent.
  The function module is not assigned to the correct message type or IDoc type.
  The system is unable to find the receiver function module due to missing or incorrect entries in the WE20 (Partner Profiles) or BD64 (Distribution Model).
  The function module might be custom and not properly registered