How To Fix 28061 - Reference to a class/object required

SAP Error Message - Details

• Message type: E = Error

• Message class: 28 - Configuration

• Message number: 061

• Message text: Reference to a class/object required

What causes this issue?

The syntax check found an error where a class or object is entered.

System Response

The cursor marks the place in your entry where the error occurs.

How to fix this error?

A class or other object is expected at this point. A class is referred
to by the class type and the language-independent class name, for
example:
(300)TV_SET
To refer to an object, enter the object identifier, class type, and
object key:
(MATERIAL)(300)(NR='M4711')
The object identifier is the language-independent name for the master
data table for the object. Object identifiers are defined in the IMG
for <ZH>Classification</>. In step <LS>Define object types</>, an
object identifier is entered for each object type. This identifier
identifies the object type in dependencies. 'Material' is the object
identifier for materials.
Characteristics are always entered with reference to an object. If a
variable is defined for an object, only enter the variable.

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

(300)DESK.MATERIAL = 'OAK' or
D.MATERIAL = 'OAK'
Please note also other possible causes of error (messages).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 28061 - Reference to a class/object required ?

  The SAP error message "28061: Reference to a class/object required" typically occurs in ABAP programming when the system expects a reference to a class or object, but it receives something else (like a primitive data type or an uninitialized variable). This error can arise in various scenarios, such as when trying to instantiate a class or when calling a method that requires an object reference.
  Causes:
  
  Uninitialized Object Reference: You may be trying to use an object that has not been instantiated.
  Incorrect Data Type: The code might be passing a primitive data type (like an integer or string) where an object reference is expected.
  Scope Issues: The object reference might be out of scope or not accessible in the current context.
  Incorrect Method Call: Calling a method that requires an object reference without providing one.
  
  Solutions:
  
  
  Check Object Initialization: Ensure that the object is properly instantiated before it is used. For example:
  DATA: my_object TYPE REF TO my_class.
  CREATE OBJECT my_object.
  
  
  Verify Data Types: Make sure that the variables being passed to methods or functions are of the correct type. If a method expects an object reference, ensure you are passing an object reference and not a primitive type.
  
  
  Scope and Accessibility: Check the scope of the object reference. Ensure that the object is declared in a scope that is accessible where it is being used.
  
  
  Review Method Signatures: If you are calling a method, review its signature to ensure you are providing the correct parameters, especially if it requires an object reference.
  
  
  Debugging: Use the ABAP debugger to step through the code and inspect the values of variables at runtime. This can help identify where the object reference is not being set correctly.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for more details on object-oriented programming in ABAP.
  SAP Community: Engage with the SAP Community forums for discussions and solutions related to similar issues.
  Error Handling: Implement error handling in your code to gracefully manage situations where an object reference might not be available.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.