How To Fix B1128 - A message type could not be (uniquely) identified

B1128 - Overview

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 128

• Message text: A message type could not be (uniquely) identified

What causes this issue?

In order that IDOCs can be sent in this case with the help of the ALE
customer distribution model, the partner profiles for the message
control for the application &v1&, message type &v2&, change message
'&v3&', partner type 'LS' and partner role ' ' must contain the same
message type for all parameter numbers.
In this case, a total of &v4& different message types were detected.

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?

You need to maintain the partner profiles for the message control such
that the same message type gets used for all partners with the
selection criteria listed above.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1128 - A message type could not be (uniquely) identified ?

  The SAP error message B1128, which states "A message type could not be (uniquely) identified," typically occurs in the context of SAP's IDoc (Intermediate Document) processing. This error indicates that the system is unable to determine the correct message type for the IDoc being processed, which can lead to issues in data transfer or integration processes.
  Causes:
  
  Missing or Incorrect Configuration: The message type may not be properly configured in the system. This can happen if the message type is not defined in the relevant IDoc type or if the configuration settings are incomplete.
  Multiple Message Types: If there are multiple message types that could potentially match the incoming IDoc, the system may struggle to identify which one to use.
  IDoc Structure Issues: The structure of the IDoc may not match the expected format, leading to ambiguity in identifying the message type.
  Transport Issues: If the IDoc is being sent from one system to another,