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A supplier record holds the vendor’s contact details, payment terms (for example “Net 30”) and tax ID. Every purchase invoice belongs to a supplier.

Add a supplier

Catalog → Suppliers → New Supplier. Name and contact details are enough to start; payment terms help you see what is due when.

Linking a supplier’s item numbers to your products

This is the part that pays off. Distributors use their own item numbers, which rarely match your SKUs. Each time you tell PRODUCT_NAME “this vendor’s number is that product of mine”, it remembers.
1

Open the supplier

Catalog → Suppliers, then the supplier.
2

Link a product

Use Link Product and pair the supplier’s item number with your product.
You can also do this while reviewing a scanned invoice — mapping an unmatched line to one of your products saves the link at the same time.
The more of these links exist, the less review a scanned invoice needs. After a few invoices from the same distributor, most lines match themselves.

Returns and credit memos

Goods going back to a supplier are recorded as a return rather than a negative purchase. See Purchase invoices.