When billing retainage in Billing, the retainage billed amount is prorated between all invoices that held retainage on the job (for Quick bill invoices) or that contract item (for Contract based invoices).

If the prorated amount is less than .01, the amount per distribution is rounded to 0.00 and the remaining .01 transaction is created as retainage overbilled.

To bill small amounts of retainage, bill the retainage in Accounts Receivable.