How To Fix MN434 - Message class, error category, or message number missing

SAP Error Message - Details

• Message type: E = Error

• Message class: MN - Message class for subsequent settlement (Purchasing)

• Message number: 434

• Message text: Message class, error category, or message number missing

What causes this issue?

The message class (&V1&), error category (&V2&), or message number (&V3&
) is missing.

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?

Contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MN434 - Message class, error category, or message number missing ?

  The SAP error message MN434 typically indicates that there is a problem with the configuration or setup of message classes, error categories, or message numbers in the SAP system. This error can occur in various contexts, often related to message handling or logging within the system.
  Cause:
  
  Missing Configuration: The message class, error category, or message number that the system is trying to reference does not exist or has not been properly configured in the system.
  Custom Development Issues: If there are custom programs or enhancements that reference specific message classes or numbers, and those have not been defined, this error can occur.
  Transport Issues: If changes were transported from one system to another (e.g., from development to production) and the transport did not include the necessary message classes or configurations, this error may arise.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to access certain message classes or categories.
  
  Solution:
  
  
  Check Message Class Configuration:
  
  Use transaction code SE91 to check if the message class and the specific message number exist. If they do not exist, you may need to create them.
  If the message class exists but the message number does not, you can create the missing message in the message class.
  
  
  
  Review Custom Code:
  
  If the error is triggered by custom code, review the code to ensure that it references valid message classes and numbers. Update the code if necessary.
  
  
  
  Transport Management:
  
  If the issue is related to transport, ensure that all necessary objects, including message classes, are included in the transport request and have been successfully imported into the target system.
  
  
  
  Authorization Check:
  
  Verify that the user encountering the error has the necessary authorizations to access the relevant message classes and categories.
  
  
  
  Consult Documentation:
  
  Check SAP documentation or notes related to the specific error message for any additional guidance or known issues.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SE91: Message Class Maintenance
  SE80: Object Navigator (to check for custom developments)
  SE37: Function Module to check if any function modules are causing the issue.
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  
  
  Community Forums: Consider checking SAP Community forums or other SAP-related discussion platforms for similar issues and solutions shared by other users.
  
  
  By following these steps, you should be able to identify the root cause of the MN434 error and implement a solution to resolve it.