How To Fix 55404 - Internal error: message classification &1, message class

55404 - Overview

• Message type: E = Error

• Message class: 55 - Messages for development class EENO

• Message number: 404

• Message text: Internal error: message classification &1, message class

What causes this issue?

The message classification for the IS-U message object contains an
invalid message class. This is a program error that can only be
rectified by SAP.

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?

Note the following:
entries leading to the error
message text
and send a problem message to SAP.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 55404 - Internal error: message classification &1, message class ?

  The SAP error message 55404, which states "Internal error: message classification &1, message class," typically indicates an internal issue within the SAP system related to message handling or classification. This error can arise due to various reasons, including configuration issues, data inconsistencies, or problems with the underlying SAP application.
  Possible Causes:
  
  
  Configuration Issues: Incorrect settings in the message classification or message handling configuration can lead to this error.
  Data Inconsistencies: Inconsistent or corrupted data in the database can trigger internal errors.
  Custom Code: If there are custom developments or enhancements in the system, they might not be handling messages correctly.
  System Bugs: There may be bugs in the SAP version you are using that could lead to this error.
  Transport Issues: If the error occurs after a transport, it could be due to missing objects or dependencies.
  
  Solutions:
  
  Check Configuration: Review the configuration settings related to message handling and classification in the relevant transaction codes (e.g., SPRO).
  Analyze Logs: