How To Fix FDT_WD_EXPRESSION073 - Object &1 is not compatible with the expected result type &2

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_WD_EXPRESSION -

• Message number: 073

• Message text: Object &1 is not compatible with the expected result type &2

What causes this issue?

You have tried to assign object &v1& to the current expression. However,
for the target position where you wanted to drop object &v1&, it is
required that the dropped object is of type &v2&. This requirement is
not fulfilled by object &v1&. Therefore, object &v1& cannot be dropped
at the position that you have chosen.
This problem can occur when you want to assign an object via drag and
drop for one of the following purposes:
result data object of an expression or function
cell value in a decision table expression

System Response

The existing definition at the drop target position of the current
expression remains unchanged.

How to fix this error?

Find out which object type is required for the element at the drop
target position:
For the result data object of an expression or a function, check the
definition of that object.
For a cell in a decision table, either an elementary data object of the
same type as the column definition or an expression with a boolean
result data object must be used.

Procedure for System Administrators

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_WD_EXPRESSION073 - Object &1 is not compatible with the expected result type &2 ?

  The SAP error message FDT_WD_EXPRESSION073 indicates that there is a type mismatch in an expression within a Web Dynpro application. Specifically, it means that the object you are trying to use (denoted as &1) is not compatible with the expected result type (denoted as &2). This typically occurs in scenarios where data types do not align, such as trying to assign a string to a numeric field or using an incompatible data structure.
  Causes:
  
  Data Type Mismatch: The most common cause is that the data type of the variable or object being used does not match the expected data type. For example, if a numeric value is expected but a string is provided.
  Incorrect Binding: If the binding of the UI element to the data model is incorrect, it can lead to this error.
  Expression Errors: If you are using expressions in your Web Dynpro application, an error in the expression logic can lead to this type of error.
  Model Changes: If the underlying data model has changed (e.g., a field type was modified), it may lead to compatibility issues with existing bindings or expressions.
  
  Solutions:
  
  Check Data Types: Review the data types of the variables and ensure that they match the expected types. You can do this by checking the data dictionary or the context node definitions.
  Review Bindings: Ensure that the bindings in your Web Dynpro application are correctly set up. Check the properties of the UI elements and ensure they are bound to the correct context attributes.
  Debugging: Use the debugging tools available in the SAP environment to trace the execution and identify where the type mismatch occurs. This can help pinpoint the exact location of the error.
  Modify Expressions: If you are using expressions, review them for correctness. Ensure that the operations being performed are valid for the data types involved.
  Check for Model Changes: If there have been recent changes to the data model, ensure that all references in the Web Dynpro application are updated accordingly.
  
  Related Information:
  
  Web Dynpro Documentation: Refer to the official SAP documentation for Web Dynpro to understand the data binding and expression syntax better.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and how they resolved them.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide patches related to this error message.
  
  By following these steps, you should be able to identify and resolve the issue causing the FDT_WD_EXPRESSION073 error in your SAP Web Dynpro application.