Not able to get pick slip number.

 Hi,

I have created one move order in inventory, after allocation of the move order i generated the pick slip. In the pick slip i can see the detail information of move order like-  from sub inv, to sub inv etc... information. but i could not find the pick slip number. do we need to consider the move order number as the pick slip number? If not, how do i get the pick slip number generated.

I verified the tables mtl_txn_request_line, mtl_material_transactions_temp.

but in all these tables the pick slip number is null. After I transact the move order, i checked the mtl_material_transactions, there also the pick_slip_number column is null.