Manual Billing Setup Manual Billing Codes are setup to default G/L accounts on the financial sales document lines.  If G/L accounts are left unspecified (blank) on the Manual Billing Setup , then the G/L accounts can be selected when creating the sales document.  Financial or sundry sales documents require a Manual Billing Code to be selected when creating the invoice or credit memo.  The  Manual Billing Setup also controls which financial sales documents appear on the Billing and Income Report , for example it may be necessary to exclude intercompany recoveries from the report, or populate only the sales value, or only the income value.