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.