Hi Nikhil,
Are you trying to get the TU in EWM through shipment document in ERP ?
If you are not planning the transportation in ERP 'or' EWM, just maintain the 'no obligatory planning ' for transportation planning type against the document category & document type in your warehouse.
Here is the path,
Spro-Img-SCM Extended Warehouse Management-Extended Warehouse Management-Goods Receipt Process-Inbound Delivery-Define Transportation Planning Type (Inbound)
And also maintain the entry in ' Allow EWM Execution Without Transportation Planning (Inbound) '.
C K Reddy