Changing the fiscal position of a purchase order will auto-update purchase order lines
This module allows you to create separate shipment for each Purchase order line.
Purchase Order line Discount
Add the status of all the incoming picking in the purchase order
Show stock levels on purchases
This a glue module to combine two modules
Combine multiple RFQ or Purchase Orders (Bista)
RFQ/Draft PO products must have non Zero Unit Price (Bista)