How To Fix OO718 - Type &1 already exists in class &2

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 718

• Message text: Type &1 already exists in class &2

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO718 - Type &1 already exists in class &2 ?

  The SAP error message OO718, which states "Type &1 already exists in class &2," typically occurs when you are trying to create or define a type (such as a data type, structure, or class) that already exists in the specified class or namespace. This can happen in various contexts, such as when working with ABAP classes, interfaces, or data dictionary objects.
  Cause:
  
  Duplicate Definition: The most common cause is that you are attempting to define a type that has already been defined in the same class or in a parent class.
  Namespace Conflicts: If you are working in a custom namespace, there might be a conflict with existing types in the standard namespace or other custom namespaces.
  Incorrect Inheritance: If you are inheriting from a class that already has the type defined, and you try to redefine it in the subclass, this error can occur.
  
  Solution:
  
  
  Check Existing Definitions: 
  
  Use the ABAP Workbench (SE80) or the Class Builder (SE24) to check if the type you are trying to create already exists in the specified class.
  Look for the type in the class definition and ensure that you are not duplicating it.
  
  
  
  Rename the Type: 
  
  If you find that the type already exists and you need a new type, consider renaming your type to something unique.
  
  
  
  Modify Inheritance: 
  
  If you are inheriting from a class, review the parent class to see if the type is already defined there. You may not need to redefine it in the subclass.
  
  
  
  Use Unique Namespaces: 
  
  If you are working in a custom namespace, ensure that your naming conventions are unique to avoid conflicts with other objects.
  
  
  
  Check for Typographical Errors: 
  
  Sometimes, the error can be caused by simple typographical errors in the type name or class name. Double-check for any mistakes.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SE80 (Object Navigator)
  SE24 (Class Builder)
  SE11 (Data Dictionary)
  
  
  
  Documentation: 
  
  Review SAP documentation on ABAP classes and data types for best practices on naming conventions and type definitions.
  
  
  
  SAP Notes: 
  
  Check SAP Notes for any known issues or updates related to this error message, as there may be specific patches or recommendations from SAP.
  
  
  
  By following these steps, you should be able to resolve the OO718 error and successfully define your types in SAP.