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

MN434 - Overview

• 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.

MN434 - Details

• 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