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. 
