How To Fix OL391 - Method is not instance-dependent

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 391

• Message text: Method is not instance-dependent

What causes this issue?

You have marked a method as instance-dependent. However, the relevant
function module has no input parameters with the same names as the key
fields of the assigned object type. The result of the method is
therefore not dependent on the value of the key fields, and the method
is therefore instance-independent.

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?

Mark the method as instance-independent.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL391 - Method is not instance-dependent ?

  The SAP error message OL391, which states "Method is not instance-dependent," typically occurs in the context of ABAP programming when you are trying to call a method that is defined as a static method (class method) on an instance of a class. In object-oriented programming within SAP ABAP, static methods belong to the class itself rather than to any specific instance of the class.
  Cause:
  The error arises when:
  
  You attempt to call a static method using an instance of the class instead of calling it directly on the class itself.
  The method is defined with the CLASS-METHODS keyword, indicating that it does not require an instance of the class to be invoked.
  
  Solution:
  To resolve this error, you should call the method directly on the class rather than on an instance. Here’s how you can do it:
  
  
  Identify the Class and Method: Determine the class name and the static method you are trying to call.
  
  
  Call the Method Correctly: Use the class name to call the method. For example, if your class is named Z_MY_CLASS and the method is MY_STATIC_METHOD, you should call it like this:
  DATA: result TYPE string.
  result = Z_MY_CLASS=>MY_STATIC_METHOD( ).
  
  
  Related Information:
  
  Static Methods: These methods are shared across all instances of a class and can be called without creating an instance of the class.
  Instance Methods: These methods require an instance of the class to be called and are defined using the METHODS keyword.
  Class Definition: Ensure that you understand the difference between instance methods and class methods when designing your classes in ABAP.
  
  Additional Tips:
  
  Always check the method definition in the class to confirm whether it is a static method or an instance method.
  Review the ABAP documentation on object-oriented programming for more details on class and instance methods.
  If you are unsure about the method type, you can look at the class definition in the ABAP Workbench (SE80 or SE24).
  
  By following these guidelines, you should be able to resolve the OL391 error effectively.