Answer: All Solid Route Accounting™ business systems that monitor customer account balances allow for credit balances, which are indicated by a negative number as that customer's current balance.
For example, if a customer has a balance of $50.00 but makes a payment of $200.00, then after applying that payment to their account by using a Received On Account (ROA) transaction, they will have an account balance of -$150.00. In Solid Business Central™, if a customer has a credit balance when the next credit invoice is created for that customer, their balance will start to increase once again.
Please note that invoices are not automatically marked as paid and will still require manual marking through an ROA transaction marking process, even though it may appear that the credit balance is being applied automatically to the invoice.