How To Fix C5899 - Message numbers 900 to 999 are reserved for customers !!!

SAP Error Message - Details

• Message type: E = Error

• Message class: C5 - Master Recipe

• Message number: 899

• Message text: Message numbers 900 to 999 are reserved for customers !!!

Self-Explanatory Message

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• What is the cause and solution for SAP error message C5899 - Message numbers 900 to 999 are reserved for customers !!! ?

  The SAP error message C5899, which states "Message numbers 900 to 999 are reserved for customers," typically occurs when a custom message number is being used in the SAP system that falls within the range reserved for customer-defined messages. Here’s a breakdown of the cause, solution, and related information for this error:
  Cause:
  
  Message Number Conflict: In SAP, message numbers 900 to 999 are reserved for customer-specific messages. If a developer or user attempts to create or reference a message in this range without proper configuration, the system will throw this error.
  Custom Development: This error often arises during custom development or when using custom function modules, reports, or enhancements that reference these message numbers incorrectly.
  
  Solution:
  
  Use Valid Message Numbers: Ensure that any custom messages you create are assigned message numbers outside the range of 900 to 999. You can use numbers from 000 to 899 or from 1000 onwards.
  Check Message Class: If you are working with a message class, verify that the message numbers you are using are correctly defined in the message class and do not conflict with the reserved range.
  Adjust Code: If the error is occurring in custom code, review the code to ensure that it does not reference any message numbers in the reserved range. Update the code to use valid message numbers.
  Create New Messages: If you need to create new messages, go to transaction SE91 (Message Class) and create a new message with a valid number.
  Transport Requests: If this error occurs during a transport, ensure that the transport request does not include any references to invalid message numbers.
  
  Related Information:
  
  Message Classes: In SAP, message classes are used to group related messages. Each message class can contain multiple messages, and it is essential to manage these correctly to avoid conflicts.
  SAP Notes: Check SAP Notes for any updates or specific guidance related to this error. SAP frequently updates its documentation and provides solutions for common issues.
  Development Guidelines: Follow SAP's development guidelines to avoid using reserved message numbers and ensure that custom developments adhere to best practices.
  
  By following these steps, you should be able to resolve the C5899 error and ensure that your custom messages are correctly defined and utilized within the SAP system.