Hi Indraneel, I am not sure about the Outbound delivery however for inbound you can perfrom the activity using Expected goods receipt functionality..
1) Create Purchase order in ECC
2) Create EGR in EWM ( /SCWM/ERP_DLV_DELETE)
3) as a result of above activity system will create inbound delivery directly in EWM and the same will carry forward in ECC upon Goods Receipt