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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message WA651 - Receiver function module &: Error determining interface ?

  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 or transported.
  
  
  
  
  Solution
  
  
  Check Partner Profiles (WE20):
  
  Verify that the partner profile for the receiver is correctly maintained.
  Ensure the outbound parameters specify the correct message type and receiver function module.
  Confirm that the function module exists and is correctly assigned.
  
  
  
  Check Distribution Model (BD64):
  
  Verify that the distribution model includes the correct message type and receiver system.
  Ensure the model is activated and consistent.
  
  
  
  Verify Function Module:
  
  Check if the receiver function module exists in the system (use SE37).
  Confirm that the function module is designed to handle the message type and interface.
  If it is a custom function module, ensure it is properly transported and active.
  
  
  
  Check IDoc Type and Message Type:
  
  Confirm that the IDoc type and message type are consistent between sender and receiver.
  Use transaction WE30 to check IDoc types and WE81 for message types.
  
  
  
  Re-generate or Re-assign Interfaces:
  
  Sometimes re-generating the interface or re-assigning the function module in the partner profile helps.
  
  
  
  Check for OSS Notes:
  
  Search SAP OSS Notes for any known issues related to this error message and your SAP version.
  
  
  
  Debugging:
  
  If the above steps do not resolve the issue, debugging the function module or the ALE inbound processing (e.g., function module IDOC_INBOUND_ASYNCHRONOUS) can help identify where the interface determination fails.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  WE20 - Partner Profiles
  BD64 - Distribution Model
  WE02 / WE05 - IDoc Monitoring
  SE37 - Function Module Test
  WE30 - IDoc Type Development
  WE81 - Message Type Maintenance
  
  
  
  Common SAP Notes:
  
  Check SAP Notes related to ALE/IDoc interface errors.
  Example: SAP Note 000651 (example number, check actual notes for your system).
  
  
  
  Documentation:
  
  SAP Help Portal on ALE and IDoc processing.
  SAP Community forums for similar issues.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  System cannot determine the interface for the receiver function module during ALE/IDoc processing.
  
  
  Solution
  Verify partner profiles, distribution model, function module existence and assignment, IDoc/message types, and apply corrections.
  
  
  Related Info
  Use WE20, BD64, SE37, WE02, WE05; check SAP Notes and debug if necessary.
  
  
  
  
  If you provide more context (e.g., transaction where error occurs, IDoc/message type, or system version), I can help with more specific guidance.