How To Fix OO_SOURCE_BASED019 - The sub component &1 cannot be converted to a &2

SAP Error Message - Details

• Message type: E = Error

• Message class: OO_SOURCE_BASED - WB - Class Builder - Messages for the source-b. Class Editor

• Message number: 019

• Message text: The sub component &1 cannot be converted to a &2

What causes this issue?

You tried to convert the sub component &V1& to another kind.

System Response

The editor does not support a conversion of sub components to another
kind (exception, parameter) within one activation step. The source is
not stored in the system.

How to fix this error?

Delete the old component &V1&
Save and activate the class or interface
Create the new &V2& &V1&

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OO_SOURCE_BASED019 - The sub component &1 cannot be converted to a &2 ?

  The SAP error message OO_SOURCE_BASED019 indicates that there is an issue with the conversion of a subcomponent to a specified type. This error typically arises in the context of Object-Oriented programming in ABAP, particularly when dealing with class instances and their attributes.
  Cause:
  The error message "The sub component &1 cannot be converted to a &2" usually occurs due to one of the following reasons:
  
  
  Type Mismatch: The subcomponent (attribute or method) you are trying to convert is not compatible with the target type. For example, you might be trying to assign an object of one class to a variable of another class that is not a superclass or interface of the first.
  
  
  Incorrect Casting: If you are using type casting (e.g., CAST or AS), the object you are trying to cast may not be of the expected type.
  
  
  Inheritance Issues: If the subcomponent is part of a class hierarchy, the object may not be an instance of the expected subclass.
  
  
  Interface Implementation: If the subcomponent is expected to implement a certain interface, it may not do so, leading to conversion issues.
  
  
  Solution:
  To resolve the OO_SOURCE_BASED019 error, you can take the following steps:
  
  
  Check Data Types: Verify that the data types of the subcomponent and the target type are compatible. Ensure that you are not trying to assign an incompatible type.
  
  
  Review Class Hierarchy: If you are working with inheritance, check the class hierarchy to ensure that the object you are trying to convert is indeed a subclass or implements the required interface.
  
  
  Use Proper Casting: If you are using type casting, ensure that you are using the correct syntax and that the object is of the type you are trying to cast it to. You can use CAST or AS appropriately.
  
  
  Debugging: Use the ABAP debugger to inspect the values and types of the objects involved in the conversion. This can help you identify where the type mismatch is occurring.
  
  
  Check for Null Values: Ensure that the object you are trying to convert is not null or uninitialized, as this can also lead to conversion errors.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for Object-Oriented ABAP programming for more details on class and object handling.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and how they resolved them.
  Error Handling: Implement error handling in your code to gracefully manage situations where type conversions may fail.
  
  By following these steps, you should be able to identify and resolve the cause of the OO_SOURCE_BASED019 error in your SAP environment.