How To Fix B1231 - Message type & has already been defined in model view &

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 231

• Message text: Message type & has already been defined in model view &

What causes this issue?

In connection with a sender and receiver a message type can only be
defined in several model views if the periods of validity of the model
views are disjunctive.
The message type &V1& for sender &V3& and receiver &V4& is already
defined in the model view &V2&, whose period of validity coincides with
that of the model view to be updated.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1231 - Message type & has already been defined in model view & ?

  The SAP error message B1231 indicates that a message type has already been defined in the specified model view. This typically occurs in the context of Business Application Programming Interfaces (BAPIs) or when working with IDocs (Intermediate Documents) in SAP.
  
  Cause:
  
  
  Duplicate Definition: The error arises when there is an attempt to define a message type that already exists in the model view. This can happen if:
  
  You are trying to create a new message type with the same name as an existing one.
  There is a configuration or customization that has already defined the message type in the system.
  
  
  
  Model View Conflicts: If multiple users or processes are trying to define or modify the same message type simultaneously, it can lead to conflicts.
  
  
  
  Solution:
  
  
  Check Existing Definitions: 
  
  Go to the relevant transaction (e.g., WE30 for IDoc types) and check if the message type already exists in the model view.
  If it does, you may need to use