These preferences check boxes pertain to making and receiving Purchase Orders.
Require order approval. This option places an "Approved" checkbox on the Purchase Order form, allowing someone with appropriate user permissions (such as a manager) to approve each PO before it goes out.
Auto fill PO back order on receiving. Normally, when creating a Purchase Order, all line items' quantities are initially set at zero. If checked, each line item's quantity will be automatically set to fill the entire back order from the PO.
Show PO Back Order on receiving. Back ordered items (those with a quantity of zero) are typically removed from a PO's Receiving Doc. If checked, even zero-quantity Items are displayed on the Receiving Doc.
Limit items for purchasing to items that have the current vendor listed as a preferred vendor. Only those Items for which the PO's Vendor is a Preferred Vendor can be added to the Purchase Order.
Deny receiving quantities greater than ordered. If checked, and when creating a Receiving Doc from a Purchase Order, you cannot list quantities on the Receiving Doc that exceed the quantity currently on back order.
Update purchase cost after receiving. Check if you want to update the purchase cost on the item editor each time you create a receiver for the item.
Ignore 0 cost on reorder analysis: Check this to set the Ignore zero cost to be checked by default each time the Reorder Analysis Screen it open.
Use SO or WO location on linked POs. When creating linked POs, All Orders will use the default location ('HQ'). Check this to optionally use the sales order location or work order step location.
Copy purchase order line comments to receiver. Copies the purchase order comments to the receiver.