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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message 55400 - Internal error: Message classification &1, length < 7 ?

  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 Message Configuration: Review the configuration settings related to message handling in the SAP system. Ensure that all message classifications are correctly defined and meet the required length criteria.
  Review Custom Code: If there are any custom developments, review the code to ensure that it correctly handles message classifications and does not produce malformed messages.
  System Logs: Check the system logs (transaction SM21) for any additional error messages or warnings that might provide more context about the issue.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that might address this specific error. SAP frequently releases notes that provide fixes or workarounds for known issues.
  Data Consistency Check: Run consistency checks on the relevant tables to ensure that there is no data corruption affecting message handling.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including the context in which it occurs.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM21 (System Log), SLG1 (Application Log), and SE80 (Object Navigator) to investigate the issue further.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Documentation: Review SAP documentation related to message handling and classifications to ensure compliance with best practices.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.