How To Fix OO222 - Friends relationship &1 &2: Invalid type category (only classes allowed)

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 222

• Message text: Friends relationship &1 &2: Invalid type category (only classes allowed)

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO222 - Friends relationship &1 &2: Invalid type category (only classes allowed) ?

  The SAP error message OO222 indicates that there is an issue with the relationship type in the Object-Oriented (OO) programming context, specifically when dealing with classes and their relationships. The message states that the type category is invalid and that only classes are allowed for the specified relationship.
  Cause:
  The error typically arises in the following scenarios:
  
  Incorrect Relationship Definition: You may be trying to define a relationship between objects that are not classes. For example, if you are trying to create a relationship between a class and a data element or a structure, this error will occur.
  Misconfiguration in Class Hierarchy: If the class hierarchy is not set up correctly, or if there are references to non-class objects in the relationship definitions, this can lead to the OO222 error.
  Typographical Errors: Sometimes, simple typographical errors in the class names or relationship definitions can lead to this error.
  
  Solution:
  To resolve the OO222 error, you can take the following steps:
  
  
  Check Relationship Definitions: Review the relationship definitions in your class. Ensure that all related objects are indeed classes and not other types of objects (like structures or data elements).
  
  
  Verify Class Hierarchy: Ensure that the class hierarchy is correctly defined. Check that all parent and child classes are properly set up and that there are no references to invalid types.
  
  
  Correct Typographical Errors: Look for any typographical errors in the class names or relationship definitions. Ensure that the names match exactly with the defined classes.
  
  
  Use Transaction Codes: If you are working in the SAP GUI, you can use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to inspect and modify the class definitions and relationships.
  
  
  Consult Documentation: If you are unsure about the relationships and class definitions, refer to the SAP documentation or help resources for guidance on how to properly define relationships in your specific context.
  
  
  Testing: After making the necessary changes, test the functionality again to ensure that the error has been resolved.
  
  
  Related Information:
  
  Object-Oriented Programming in SAP: Understanding the principles of object-oriented programming in SAP can help in defining classes and relationships correctly.
  SAP Community and Forums: Engaging with the SAP community can provide insights and solutions from other users who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the cause of the OO222 error in your SAP environment.