How To Fix CL089 - Internal class type & cannot be used in class maintenance

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 089

• Message text: Internal class type & cannot be used in class maintenance

What causes this issue?

You are using an internal class type. This is not allowed in class
maintenance functions.

How to fix this error?

Please switch to another class type using the <LS>Change class type</>
function.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL089 - Internal class type & cannot be used in class maintenance ?

  The SAP error message CL089 indicates that there is an issue with the use of an internal class type in class maintenance. This typically occurs when you are trying to create or modify a class in the ABAP Workbench, and the system has detected that the class type you are trying to use is not valid for the operation you are attempting.
  Cause:
  
  Internal Class Type: The error usually arises when you are trying to use a class that is defined as an internal class type (e.g., a class that is not intended for external use or is defined within another class).
  Incorrect Class Definition: The class you are trying to maintain may not be properly defined or may be a local class that cannot be accessed in the context you are working in.
  Namespace Issues: If the class is defined in a different namespace or package that is not accessible, it can lead to this error.
  
  Solution:
  
  Check Class Definition: Ensure that the class you are trying to use is defined correctly and is not an internal class. If it is an internal class, you may need to refactor your code to use a public class instead.
  Use Public Classes: If you need to use a class in a different context, make sure it is declared as a public class. You can do this by checking the visibility settings in the class definition.
  Namespace Verification: Verify that the class is in the correct namespace and that you have the necessary authorizations to access it.
  Refactor Code: If you are trying to use a local class from another class, consider refactoring your code to either move the class to a more accessible location or to use a different design pattern that does not rely on internal classes.
  Check for Typos: Ensure that there are no typographical errors in the class name or in the way you are referencing it.
  
  Related Information:
  
  ABAP Class Types: In ABAP, classes can be defined as local (internal) or global (public). Local classes are only accessible within the context they are defined, while global classes can be accessed from anywhere in the system.
  Class Maintenance: Class maintenance in SAP is done through transaction codes like SE24 (Class Builder) or SE80 (Object Navigator). Familiarize yourself with these tools to better manage class definitions.
  Documentation: Refer to the SAP Help Portal or the ABAP documentation for more detailed information on class definitions and visibility rules.
  
  If the issue persists after checking these points, consider reaching out to your SAP Basis or ABAP development team for further assistance.