How To Fix WL109 - Expression & has data type reference & and not &

WL109 - Overview

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 109

• Message text: Expression & has data type reference & and not &

What causes this issue?

According to the container definition, expression &v1& references an
object of type &v2&. However, the container element to which this
expression is allocated is defined with ABAP Dictionary reference &v3&.

System Response

This allocation is not permitted.

How to fix this error?

Change the allocation.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WL109 - Expression & has data type reference & and not & ?

  The SAP error message WL109 indicates a type mismatch in an expression. Specifically, it means that the expression you are trying to evaluate has a data type that is a reference type, but the expected data type is different. This error typically occurs in ABAP (Advanced Business Application Programming) when you are working with data types and trying to assign or compare values that are not compatible.
  
  Cause:
  The error can occur due to several reasons:
  
  Type Mismatch: You are trying to use a reference type (like a reference to an object or a structure) in a context where a different type (like a value type) is expected.
  Incorrect Variable Declaration: The variable you are using may not be declared correctly, or you may be using a reference variable where a value variable is expected.
  Improper Use of Data Types: You might be trying to perform operations or comparisons between incompatible data types.
  
  
  Solution:
  To resolve the