Automatic Vouchering
Normally, vouchers for material received are created using the Generate A/P Transactions or Voucher Builder forms. However, you can avoid that step by using automatic vouchering.
Note: When you create a purchase order, whether on the 
		  Purchase Orders, 
		  Purchase Order Builder, or 
		  Purchase Orders Quick Entry form, the 
		  Auto Voucher field will
		  default to the setting made at the vendor level. 
		
 
		       To receive a purchase order from a vendor using automatic vouchering, perform these steps:
Note:  If the pre-existing receipts have different costs, they are
		  vouchered at the cost of the latest receipt and an offsetting journal entry is
		  created.