Trading
Trading company billing
Sale, purchase, and parties. Warehouses when the goods sit in more than one place. Sales tax on the invoice.
Sale and purchase
The same books hold what you sell and what you buy.
Parties
A customer, a supplier, or both. The balance stays on the party.
POS and stock
The counter is on. Stock is on. Manufacturing is off.
Sales tax
The invoice is a sales tax invoice. Payment is as agreed.