How To Fix 55400 - Internal error: Message classification &1, length < 7

55400 - Overview

• Message type: E = Error

• Message class: 55 - Messages for development class EENO

• Message number: 400

• Message text: Internal error: Message classification &1, length < 7

What causes this issue?

Message classification (&V1&) for the IS-U message object has an
invalid length. 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:
transaction
entries leading to the error
message text
and send a problem message to SAP.

Error message extract from SAP system. Copyright SAP SE.

55400 - Details

• The SAP error message "55400 Internal error: Message classification &1, length < 7" typically indicates an internal inconsistency or issue within the SAP system related to message handling. This error can occur in various contexts, such as during the processing of messages in the system, particularly in the areas of communication or logging.
  
  Cause:
  
  Message Classification Issue: The error suggests that there is a problem with the message classification, which is expected to have a certain length. If the length is less than 7, it indicates that the message is malformed or not properly defined.
  Configuration Errors: There may be issues in the configuration of the message handling or communication settings in the SAP system.
  Data Corruption: There could be corrupted data in the message handling tables or related configurations.
  Custom Code: If there are custom developments or enhancements in the system, they might be causing the error due to incorrect handling of message classifications.
  
  
  Solution:
  
  Check