Reading balances
Each ledger row has a signed amount. Positive means we owe the supplier; negative means a payment or credit reduced what we owe. A balance is the sum of the rows, per currency. USD and CAD are not added together on the ledger (there is no netted total yet - see Not built yet).Recording things
Rows are not edited; correct a mistake by deleting the row (admin) or adding an offsetting row.