Hi Vignesh,
What application a work-item should use at runtime is defined in the Task Handler.
Assuming you are using a custom workflow class with a dummy method, you will need to maintain the task visualization ( TCODE = SWFVISU ).
In the task visualization maintain application name = <Your WDA name> like so,
The WI_ID=${item.externalID} passes the key to the workflow when the user executes the work-item.
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Linkin Pereira