How To Fix OL390 - Method is instance-dependent (key field parameters in FM)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 390

• Message text: Method is instance-dependent (key field parameters in FM)

What causes this issue?

You have flagged an API method as instance-independent. However, the
relevant function module has an input parameter with the same name as a
key field in the corresponding BOR object type. Due to the fact that an
implicit assignment between an object type key field and a function
module parameter is being created, the result of the method is
dependent on the value of the key field and is therefore
instance-specific.

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?

You should flag the method as instance-specific.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL390 - Method is instance-dependent (key field parameters in FM) ?

  The SAP error message OL390, which states "Method is instance-dependent (key field parameters in FM)," typically occurs in the context of Object-Oriented Programming (OOP) in ABAP when you are trying to call a method of a class that is instance-dependent but you are not providing the necessary instance-specific parameters.
  Cause:
  
  Instance Dependency: The method you are trying to call is designed to operate on a specific instance of a class. This means that it requires certain parameters that are tied to that instance.
  Missing Parameters: You may not be passing the required key field parameters when calling the method, which are necessary for the method to function correctly.
  Incorrect Method Call: You might be trying to call a static method as if it were an instance method, or vice versa.
  
  Solution:
  
  Check Method Definition: Review the method definition in the class to understand what parameters are required. Ensure that you are passing all necessary parameters when calling the method.
  Create an Instance: If the method is instance-dependent, ensure that you have created an instance of the class before calling the method. For example:
  DATA: lo_instance TYPE REF TO your_class.
  CREATE OBJECT lo_instance.
  lo_instance->your_method( ... ).  " Pass required parameters
  
  Pass Key Field Parameters: Make sure to pass the key field parameters that the method requires. This may involve retrieving values from the instance or other sources.
  Review Documentation: If available, consult the documentation for the class and method to understand the expected parameters and their significance.
  
  Related Information:
  
  Object-Oriented Programming in ABAP: Familiarize yourself with the principles of OOP in ABAP, including how to create classes, methods, and instances.
  Debugging: Use the ABAP debugger to step through your code and inspect the values being passed to the method. This can help identify missing or incorrect parameters.
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message. Sometimes, there may be specific patches or updates that address related problems.
  
  By following these steps, you should be able to resolve the OL390 error and successfully call the instance-dependent method in your ABAP program.