How To Fix OL656 - Freezing of methods is allowed only for API methods

SAP Error Message - Details

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 656

• Message text: Freezing of methods is allowed only for API methods

Self-Explanatory Message

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• What is the cause and solution for SAP error message OL656 - Freezing of methods is allowed only for API methods ?

  The SAP error message OL656, which states "Freezing of methods is allowed only for API methods," typically occurs in the context of ABAP programming when you are trying to freeze a method that is not defined as an API method. This error is related to the concept of method freezing in ABAP classes, particularly in the context of class-based programming.
  Cause:
  
  Method Definition: The method you are trying to freeze is not defined as an API method. In ABAP, only methods that are explicitly marked as API methods can be frozen. API methods are typically those that are intended for external use or are part of a public interface.
  Incorrect Method Type: The method might be a private or protected method, which cannot be frozen.
  Freezing Context: The freezing operation is being attempted in a context that does not support it, such as within a non-API class or method.
  
  Solution:
  
  Check Method Definition: Ensure that the method you are trying to freeze is defined as an API method. You can do this by checking the method's visibility and ensuring it is marked as PUBLIC or PROTECTED if it is intended for external use.
  Modify Method Visibility: If the method is not intended to be an API method, consider whether it should be made public or if you should not attempt to freeze it.
  Use Correct Syntax: Ensure that you are using the correct syntax for freezing methods. The freezing operation should be done in the appropriate context and with the correct method signature.
  Review Class Design: If you are frequently encountering this issue, it may be worth reviewing the design of your classes and methods to ensure that they are structured correctly according to ABAP best practices.
  
  Related Information:
  
  API Methods: In ABAP, API methods are typically those that are intended for use by other programs or classes. They are part of the public interface of a class and can be called from outside the class.
  Freezing Methods: Freezing a method in ABAP means that the method's implementation is locked and cannot be changed in subsequent versions of the class. This is often used in scenarios where backward compatibility is important.
  ABAP Class Documentation: Refer to the official SAP documentation on ABAP classes and methods for more detailed information on method visibility, freezing, and best practices in class design.
  
  If you continue to face issues, consider reaching out to your SAP support team or consulting the SAP community for further assistance.