Triggerring workflow for delete travel request.

Hi Experts,

We have a requirement to trigger email notification when an employee deletes his travel request.

For this I have created a workflow and made it to trigger by using event "EmployeeTrip.Deleted" of business object 'BUS2089'.

Please find below the screen-shots for the same.

The workflow is getting ended up in error . Below is the error

Source (expression '&TRIP.EMPLOYEENUMBER&') of binding assignment is not

available.

But I made binding from event to workflow.

Kindly help me .

Regards,

Shankar.