How To Fix 29653 - Only an object can be allocated to an object type

SAP Error Message - Details

• Message type: E = Error

• Message class: 29 - Bills of Material

• Message number: 653

• Message text: Only an object can be allocated to an object type

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 29653 - Only an object can be allocated to an object type ?

  The SAP error message "29653: Only an object can be allocated to an object type" typically occurs in the context of object-oriented programming within SAP, particularly when dealing with class instances and object references. This error indicates that there is an attempt to assign a non-object value (like a primitive data type) to a variable that is expected to hold an object reference.
  Cause:
  
  Type Mismatch: The most common cause of this error is trying to assign a value that is not an object (e.g., a string, integer, or other primitive types) to a variable that is defined to hold an object type.
  Incorrect Object Creation: If an object is not properly instantiated before being assigned, this error can occur.
  Method Return Type: If a method is expected to return an object but returns a non-object type, this can lead to the error when trying to assign the return value to an object reference.
  
  Solution:
  
  
  Check Variable Types: Ensure that the variable you are trying to assign the value to is indeed defined as an object type. If it is not, you need to change the variable type or ensure that you are assigning an object to it.
  
  
  Instantiate Objects Properly: Make sure that any object you are trying to assign has been properly instantiated using the CREATE OBJECT statement. For example:
  DATA: lo_object TYPE REF TO your_class.
  CREATE OBJECT lo_object.
  
  
  Review Method Definitions: If you are calling a method that is supposed to return an object, check the method definition to ensure it is returning the correct type. If it is returning a primitive type, you need to modify the method to return an object instead.
  
  
  Debugging: Use the debugger to step through your code and inspect the types of the variables involved in the assignment. This can help you identify where the type mismatch is occurring.
  
  
  Related Information:
  
  ABAP Object-Oriented Programming: Familiarize yourself with the principles of object-oriented programming in ABAP, including class definitions, object instantiation, and method definitions.
  SAP Documentation: Refer to the official SAP documentation for more details on error messages and object-oriented programming in ABAP.
  Community Forums: Consider checking SAP community forums or Stack Overflow for similar issues and solutions shared by other developers.
  
  By following these steps, you should be able to resolve the error and ensure that your code adheres to the object-oriented principles expected in SAP ABAP.