When you create a purchase order, you must indicate which type of order it is. You can select one of the types that are mentioned here:
Journal: This type of purchase order is used as draft. This type does not affect stock quantities and does not generate item transactions. The purchase order journal lines are not included in master scheduling.
Purchase order: It is used when the vendor confirms an order.
Returned order: Used when goods returned to the vendor. The returned item number which is the RMA number, that the vendor gives you must be entered on the Other tab.