Hi Sunil,
If your using POSC , for the unloading step set source bin is door bin & destination bin is GR staging area.
once you confirm WT means GR is done. In WPT configuration one check box is there ' confirm immediately' , use this to confirm the step automitacally.
If you want to get WPT automtically against IBD, use PPF actions under the applicatio /SCDL/ DELIVERY.
C K REDDY