How To Fix C0303 - - Charact. & &: Message category & is not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: C0 - PP-PI: Messages for PI Sheet and Syntax Checker

• Message number: 303

• Message text: - Charact. & &: Message category & is not defined

What causes this issue?

In the process instruction, message category &V3& has been assigned to
characteristic &V1& &V2&.
However, message category &V3& is not or no longer defined in
Customizing .

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?

Check and if necessary, correct
the value assigned to characteristic &V1& &V2& in the process
instruction
the definition of message categories in Customizing

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C0303 - - Charact. & &: Message category & is not defined ?

  The SAP error message C0303 - "Character & &: Message category & is not defined" typically indicates that there is an issue with the message class or message number being referenced in your SAP system. This error can occur in various contexts, such as during the execution of a program, transaction, or when trying to display a message that is not defined in the system.
  Cause:
  
  Undefined Message Class: The message class or message number being referenced does not exist in the SAP system.
  Incorrect Configuration: There may be a configuration issue where the message class is not properly set up or is missing.
  Transport Issues: If the message class was recently transported from another system, it may not have been transported correctly.
  Development Errors: If you are working in a custom development environment, the developer may have referenced a message that has not been created.
  
  Solution:
  
  
  Check Message Class: Verify that the message class and message number are correctly defined in the SAP system. You can do this by using transaction SE91 (Message Class Maintenance) to check if the message class exists and contains the specified message.
  
  
  Create Missing Messages: If the message class exists but the specific message is missing, you can create it in SE91. Ensure that you provide the correct text for the message.
  
  
  Review Custom Code: If the error occurs in custom code, review the code to ensure that it is referencing the correct message class and message number.
  
  
  Transport Check: If the message class was supposed to be transported from another system, check the transport logs to ensure that it was successfully imported.
  
  
  Consult Documentation: If you are unsure about the message class or its purpose, consult the documentation or reach out to your SAP support team for assistance.
  
  
  Related Information:
  
  Transaction SE91: Use this transaction to manage message classes and messages in SAP.
  Transaction SE80: This transaction can be used to check the program or object where the error is occurring.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional context.
  
  If the issue persists after following these steps, it may be beneficial to engage with your SAP Basis or development team for further investigation.