How To Fix FDT_WD_EXPRESSION079 - Object &1 is not compatible with the expected type &2

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_WD_EXPRESSION -

• Message number: 079

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

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_WD_EXPRESSION079 - Object &1 is not compatible with the expected type &2 ?

  The SAP error message FDT_WD_EXPRESSION079 indicates that there is a type mismatch in the context of a Web Dynpro application. Specifically, it means that an object of a certain type (denoted as &1) is being used where a different type (denoted as &2) is expected. This can occur in various scenarios, such as when binding data to UI elements or when performing operations that require specific data types.
  Cause
  The error typically arises from one of the following situations:
  
  Data Type Mismatch: The data type of the object being passed does not match the expected data type. For example, trying to assign a string to a numeric field.
  Incorrect Binding: The binding of UI elements to the model might be incorrect, leading to a situation where the expected type does not match the actual type of the bound data.
  Model Configuration Issues: The model used in the Web Dynpro application may not be configured correctly, leading to type inconsistencies.
  
  Solution
  To resolve the error, you can take the following steps:
  
  
  Check Data Types: Review the data types of the objects involved. Ensure that the object you are trying to use is of the expected type. You may need to convert the data type if necessary.
  
  
  Review Bindings: Inspect the bindings in your Web Dynpro application. Make sure that the UI elements are bound to the correct model attributes and that the types match.
  
  
  Debugging: Use the debugging tools available in SAP to trace the execution and identify where the type mismatch occurs. This can help you pinpoint the exact location in the code or configuration that is causing the issue.
  
  
  Model Configuration: If you are using a custom model, ensure that it is correctly defined and that the data types of the attributes match what is expected in the UI.
  
  
  Consult Documentation: Refer to the SAP documentation for Web Dynpro and the specific components you are using to understand the expected data types and binding requirements.
  
  
  Testing: After making changes, thoroughly test the application to ensure that the error is resolved and that there are no further type mismatches.
  
  
  Related Information
  
  Web Dynpro Documentation: Familiarize yourself with the Web Dynpro programming model and data binding concepts.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other developers who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on handling type mismatches in Web Dynpro applications.
  
  By following these steps, you should be able to identify and resolve the cause of the FDT_WD_EXPRESSION079 error in your SAP Web Dynpro application.