How To Fix CL145 - Class type &: & & is in use and cannot be deleted

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 145

• Message text: Class type &: & & is in use and cannot be deleted

What causes this issue?

This class is used in
<DS:GLOS.object_dependencies>object_dependencies</> and cannot be
deleted.

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?

In some dependency types, for example in
<DS:GLOS.constraint>constraints</>, you can access objects via the
class to which they are allocated. Once you have specified the class in
one of these dependencies, you can no longer delete it.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL145 - Class type &: & & is in use and cannot be deleted ?

  The SAP error message CL145 indicates that a class type (usually a class or interface) is currently in use and cannot be deleted. This typically occurs when there are dependencies or references to the class in other parts of the system, such as in other classes, programs, or even in the configuration.
  Cause:
  
  Active References: The class or interface you are trying to delete is being referenced by other objects (e.g., methods, other classes, or programs).
  Inheritance: If the class is a superclass or is being inherited by other classes, it cannot be deleted until those dependencies are resolved.
  Active Implementations: If the class is implemented in any active business logic or is part of a running application, it cannot be deleted.
  Transport Requests: If the class is part of a transport request that is still in use or has not been released, it may also prevent deletion.
  
  Solution:
  
  
  Identify Dependencies: Use transaction codes like SE80 (Object Navigator) or SE11 (Data Dictionary) to check for any references to the class. Look for:
  
  Other classes or interfaces that extend or implement it.
  Programs or function modules that use it.
  Any active transport requests that include the class.
  
  
  
  Remove References: Once you identify the dependencies, you will need to:
  
  Modify or delete the dependent objects that reference the class.
  If the class is a superclass, consider changing the inheritance structure.
  
  
  
  Check for Active Implementations: Ensure that there are no active implementations or instances of the class in use. If necessary, deactivate or remove these implementations.
  
  
  Transport Requests: If the class is part of a transport request, ensure that the request is released or not in use.
  
  
  Use the Class: If you are unable to delete the class due to its usage, consider marking it as obsolete or deprecated instead of deleting it. This way, you can prevent further use while keeping it in the system for reference.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SE80 (Object Navigator), SE11 (Data Dictionary), and SE37 (Function Builder) to analyze dependencies.
  Documentation: Always document any changes you make to classes and their dependencies to maintain clarity for future developers.
  Testing: After making changes, ensure thorough testing is conducted to confirm that the removal of the class does not affect system functionality.
  
  By following these steps, you should be able to resolve the CL145 error and successfully delete the class if it is no longer needed.