How To Fix W8134 - Assignment of variable object type & to object type & may contain errors

W8134 - Overview

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 134

• Message text: Assignment of variable object type & to object type & may contain errors

What causes this issue?

In the binding definition, you assigned a source element or an
expression with an unspecified object type reference to a target
element with reference to object type '&V2&'.
The object type of the source element is hence first determined at
runtime from the value assigned. The consistency of this binding
assignment can therefore not be checked until runtime.

System Response

As the consistency of this binding assignment cannot be checked until
runtime, this definition is not recommended.
The binding execution has errors if runtime reveals
that the object type of the binding source is not the same as the
target object type
and that the source element does not reference a subtype of the target
object type either.
This can mean that the workflow is forced into status <ZH>error</> as
well.

How to fix this error?

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.

W8134 - Details

• Certainly! Here's a detailed explanation of the SAP error message:
  
  SAP Error Message:
  W8134 Assignment of variable object type & to object type & may contain errors
  
  
  Cause:
  This warning message occurs during ABAP program syntax check or runtime when there is an assignment between two object references (variables) where the source and target object types are different or incompatible. Specifically, the system detects that the assignment of a variable of one object type to another object type may lead to runtime errors because the types are not guaranteed to be compatible.
  For example, if you have:
  DATA: obj1 TYPE REF TO cl_class1,
        obj2 TYPE REF TO cl_class2.
  
  obj1 = obj2.
  If cl_class2 is not a subclass of cl_class1 or vice versa, this assignment is potentially unsafe.
  
  Explanation:
  
  In ABAP Object-Oriented programming, object references are strongly typed.
  Assigning an object reference of one type to another requires that the types be compatible (e.g., the source type