How To Fix SWDP_WB_TOOL821 - Declaration type of parameter & has changed (& -> &)

SAP Error Message - Details

• Message type: E = Error

• Message class: SWDP_WB_TOOL - Web Dynpro: Messages for Workbench Tools

• Message number: 821

• Message text: Declaration type of parameter & has changed (& -> &)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWDP_WB_TOOL821 - Declaration type of parameter & has changed (& -> &) ?

  The SAP error message SWDP_WB_TOOL821 indicates that there is a mismatch in the declaration type of a parameter in a Web Dynpro application. This typically occurs when the parameter type in the method signature has been changed, but the corresponding usage in the application has not been updated accordingly.
  Cause:
  
  Parameter Type Change: The parameter type of a method or function module has been modified (e.g., from a reference type to a value type or vice versa).
  Inconsistent Usage: The Web Dynpro component or application is still using the old parameter type, leading to a mismatch.
  Transport Issues: If the changes were transported from one system to another, the transport might not have included all necessary objects, leading to inconsistencies.
  
  Solution:
  
  Check Method Signature: Go to the method or function module where the parameter is declared and verify the current type of the parameter.
  Update Web Dynpro Component: Open the Web Dynpro component that uses this method and update the parameter type in the relevant places (e.g., in the controller, view, or model).
  Regenerate the Component: After making changes, regenerate the Web Dynpro component to ensure that all references are updated.
  Check for Transport Issues: If the issue arose after a transport, ensure that all related objects were transported correctly. You may need to re-transport the missing objects.
  Test the Application: After making the necessary changes, test the application to ensure that the error is resolved and that the application behaves as expected.
  
  Related Information:
  
  Web Dynpro Documentation: Review SAP documentation on Web Dynpro for best practices in parameter handling and method signatures.
  SAP Notes: Check SAP Notes for any known issues related to this error message or similar issues.
  Debugging: If the issue persists, consider using debugging tools to trace the execution and identify where the mismatch occurs.
  
  By following these steps, you should be able to resolve the SWDP_WB_TOOL821 error and ensure that your Web Dynpro application functions correctly.