ERPNext Purchase Order - Insert items with supplier part number - Customization support

Purchase departments always need to enter PO through supplier part numbers as it is the most knowledgeable. We can do that with basic customization on ERPNext PO - Insert items with supplier part numbers -

See the customization document here

Do you end up buying the same item from 2 or more suppliers each of whom have their own part numbers? If yes, customisation may be needed, but if you have only one source for each product, you just can add the Supplier Part Number in the Item Description. Or add it into the Item Name field and you will be able to search and select items by Supplier Part Number.

Hope this helps.