How To Fix OO720 - The kind of component &1 cannot be changed.

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 720

• Message text: The kind of component &1 cannot be changed.

What causes this issue?

The kind of a component (e.g., from an attribute to a type) can not be
changed.

System Response

Class Builder sends an error message and does not allow the changes.

How to fix this error?

Delete the old component.
Save and activate the class.
Create the new component.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OO720 - The kind of component &1 cannot be changed. ?

  The SAP error message OO720, which states "The kind of component &1 cannot be changed," typically occurs in the context of object-oriented programming in SAP, particularly when dealing with Business Object (BO) components or classes. This error indicates that there is an attempt to change the type or kind of a component that is not allowed.
  Cause:
  
  Incompatible Change: The error usually arises when you try to change the type of a component (e.g., from a reference to a value type or vice versa) in a way that is not permitted by the SAP system.
  Inheritance Issues: If the component is part of a class hierarchy, changing its type may violate the rules of inheritance or polymorphism.
  Existing References: If there are existing references or instances of the component, changing its type could lead to inconsistencies or errors in the program logic.
  
  Solution:
  
  Review Component Definition: Check the definition of the component in the class or object. Ensure that the type you are trying to assign is compatible with the existing definition.
  Avoid Type Changes: If you need to change the type of a component, consider creating a new component with the desired type instead of modifying the existing one.
  Check Inheritance: If the component is part of a class hierarchy, ensure that the change does not violate the inheritance rules. You may need to adjust the parent class or interface instead.
  Refactor Code: If the change is necessary, refactor the code to accommodate the new type without directly changing the existing component.
  Consult Documentation: Refer to SAP documentation or community forums for specific guidelines related to the type of component you are working with.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  SAP Community: Engage with the SAP Community forums for insights from other developers who may have encountered similar issues.
  Debugging: Use the debugging tools in SAP to trace where the error occurs and understand the context better.
  
  By following these steps, you should be able to resolve the OO720 error and ensure that your component definitions are consistent and valid within the SAP environment.