What Happens When I Run Invoice Calculation or Single Invoice Calculation?

When you run Invoice Calculation (BR120) or Single Invoice Calculation (BR19.1) in update mode, the application assigns the invoice number and creates an invoice header and detail records. The transactions are flagged as having been billed and are evaluated against the ceilings. If you make adjustments and new costs are added, BR120 or BR19.1 is run again, and the new costs are assigned to a new invoice number.