How To Fix UPWB139 - ABAP-OO class &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: UPWB - Messages for Development Class UPWB

• Message number: 139

• Message text: ABAP-OO class &1 already exists

What causes this issue?

No existing ABAP-00 classes were automatically overwritten when copying
Web interfaces for reasons of caution.

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?

Delete the class manually in the transaction se80.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UPWB139 - ABAP-OO class &1 already exists ?

  The SAP error message UPWB139 indicates that there is an attempt to create an ABAP Object-Oriented (OO) class that already exists in the system. This error typically occurs when you are trying to define a new class with the same name as an existing class.
  Cause:
  
  Duplicate Class Name: The most common cause of this error is that you are trying to create a class with a name that is already in use in the SAP system.
  Namespace Issues: If you are working in a specific namespace, ensure that the class name does not conflict with existing classes in that namespace or in the global namespace.
  Transport Requests: If you are working in a development environment and have transport requests that have not yet been imported into the target system, there may be a class with the same name in the target system.
  
  Solution:
  
  Check Existing Classes: Before creating a new class, check if a class with the same name already exists. You can do this by using transaction SE80 (Object Navigator) or SE24 (Class Builder) to search for the class name.
  Rename the Class: If you find that the class already exists and you need to create a new one, consider renaming your new class to avoid the conflict.
  Use Unique Naming Conventions: Adopt a naming convention that reduces the likelihood of name collisions, such as prefixing class names with a unique identifier related to your project or module.
  Review Transport Requests: If you suspect that the class exists in another system due to transport requests, check the transport logs and ensure that the relevant transports have been imported correctly.
  Delete or Modify Existing Class: If the existing class is not needed, you may consider deleting it (if you have the necessary authorizations) or modifying it as per your requirements.
  
  Related Information:
  
  Transaction Codes: Use SE80 for Object Navigator, SE24 for Class Builder, and SE11 for Data Dictionary to explore existing classes and objects.
  Documentation: Refer to SAP Help documentation for ABAP Object-Oriented programming for best practices and guidelines on class naming and management.
  Development Guidelines: Follow SAP's development guidelines to ensure that your code is maintainable and adheres to best practices.
  
  By following these steps, you should be able to resolve the UPWB139 error and successfully create or manage your ABAP OO classes.