How To Fix C1803 - Value "&" not possible because object is assigned to class "&"

SAP Error Message - Details

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 803

• Message text: Value "&" not possible because object is assigned to class "&"

What causes this issue?

The characteristic value you have entered for the object is not valid.
The object has been allocated to several classes. There is only one
value which is allowed in all the classes to which the object has been
allocated and which contain this characteristic.

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?

Replace the value you entered with an allowed value.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C1803 - Value "&" not possible because object is assigned to class "&" ?

  The SAP error message C1803 indicates that there is an issue with the assignment of an object to a class in the context of object-oriented programming within SAP ABAP. Specifically, the error message states that a certain value (represented by "&") is not possible because the object is assigned to a specific class (also represented by "&"). 
  Cause:
  
  Class Assignment Issue: The object you are trying to use is assigned to a class that does not allow the value you are trying to assign or use.
  Data Type Mismatch: The value you are trying to assign may not be compatible with the data type expected by the class.
  Access Control: The class may have certain access restrictions that prevent the assignment of the value.
  Incorrect Object Instantiation: The object may not have been instantiated correctly, leading to issues when trying to assign values.
  
  Solution:
  
  Check Class Definition: Review the class definition to ensure that the object is correctly assigned to the appropriate class and that the class allows the value you are trying to use.
  Verify Data Types: Ensure that the data types of the value and the class attributes are compatible. You may need to convert the value to the appropriate type.
  Access Control: Check if there are any access restrictions on the class or its attributes that might be preventing the assignment.
  Instantiate Object Correctly: Make sure that the object is instantiated properly before trying to assign values to it. Use the CREATE OBJECT statement if necessary.
  Debugging: Use the ABAP debugger to step through the code and identify where the error occurs. This can help you understand the state of the object and the class at the time of the error.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on object-oriented programming and class definitions.
  SAP Community: Check the SAP Community forums for similar issues and solutions shared by other developers.
  Transaction Codes: Use transaction codes like SE80 (Object Navigator) or SE24 (Class Builder) to inspect the class and object definitions.
  
  By following these steps, you should be able to identify the root cause of the C1803 error and implement a suitable solution.