There are two methods for posting an item to a PO, and these methods determine how subsequent occurrences of the same item are added to a PO. The first posting method simply changes the quantity of the existing occurrence of the item on the PO. The second method adds a separate line to the PO that contains the additional quantity.
If you only want one line for all quantities of the item, use method 1 below. For example, you ordered a certain amount of an item and later realize you need more, so you simply want to add on to the existing quantity.
If you want a separate line for each quantity of the item, use method 2 below. For example, if you are ordering special order items, and you want to post the same "generic" special order SKU multiple times on the purchase order with different costs for the different items.
From the Posting screen of the Purchasing window, type in the SKU and press Enter. If the item is already on the PO it will display, and you can make changes to it.
From the Posting screen of the Purchasing window, type the SKU, press Tab to get to the quantity field, type the quantity, and press Enter. Press Enter again to bypass the warning that the item already exists on the PO.