Workflow in travel management

Hi Experts,

I am facing one problem.

Actually I am creating one travel request in NWBC-ESS , and the workflow (Standard) is also triggering.

But the work item is not going in approver's inbox , I checked in transaction SWEL, It is showing that approver is not there.

But I have checked , approver is there.

So what can be the probable problem ?

Thanks & Regards:

Gaurav Singh