Product Invoice:
Creation of product invoice is same as that of shipment invoice as shown above.
Same as discussed earlier, after assigning values in mandatory fields select order from order selection tab.
Select order from order selection as shown.
Under control tab, provide Invoice-tax
Provide a valid supplier document number and click create.
Purchase Receipt:
Purchase receipts can be created by, Purchasing Receipt Receipts
Select as shown below
Click New and provide mandatory fields
Select customer
Select shipment from left list.
Add Lot, quantity and location
Once done, hit Create. 
