This module is used to add products in purchase order using barcode scanner.

-- Search product for entered barcode if barcode is valid ean13.

-- In case entered barcode is not valid ean13 or product does not found with barcode value then it match entered barcode with internal reference of product.

-- Add a quantity to product if product line already exists in order.

Add products to purchase order

Raise warning if product does not exists or if found product can not be purchase.

Unique Constraints for barcode and internal reference fields

Does not allow barcode and internal reference that is already assigned to a product.

Find requirements.txt file for required python packages.