How To Fix B1420 - Selected function not implemented for message type &

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 420

• Message text: Selected function not implemented for message type &

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 B1420 - Selected function not implemented for message type & ?

  The SAP error message B1420, which states "Selected function not implemented for message type &," typically occurs in the context of the SAP IDoc (Intermediate Document) processing. This error indicates that the system is trying to process a message type for which the corresponding function has not been implemented or is not available in the system.
  Cause:
  
  Missing Function Module: The function module that is supposed to handle the specific message type is not implemented or is missing.
  Incorrect Configuration: The message type may not be correctly configured in the IDoc processing settings.
  Custom Development: If there is custom development involved, the function module may not have been created or activated.
  Version Mismatch: There may be a version mismatch between the sender and receiver systems, leading to unsupported message types.
  
  Solution:
  
  
  Check Function Module: Verify if the function module associated with the message type is implemented. You can do this by checking the relevant message type in transaction WE81 and then looking for the associated function module in transaction WE57.
  
  
  Implement Missing Function: If the function module is missing, you may need to implement it. This could involve creating a new function module or modifying an existing one to handle the specific message type.
  
  
  Configuration Review: Review the configuration settings for the IDoc processing. Ensure that the message type is correctly mapped to the appropriate function module in transaction WE57.
  
  
  Custom Development: If the message type is part of a custom development, ensure that the development is complete and that the function module is activated.
  
  
  Check for Updates: If you are working with a third-party system or an older version of SAP, check for any updates or patches that may address this issue.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific message type and its processing to ensure that all necessary steps have been followed.
  
  
  Related Information:
  
  
  Transaction Codes:
  
  WE81: Message Types
  WE57: Assigning Function Modules to Message Types
  WE60: IDoc Documentation
  WE02: IDoc Display
  WE19: IDoc Test Tool
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to the message type you are working with.
  
  
  Debugging: If the issue persists, consider debugging the IDoc processing to identify where the error occurs and gather more information about the context in which the error is raised.
  
  
  By following these steps, you should be able to identify the cause of the B1420 error and implement a solution to resolve it.