Cash Flow Engine Reference Guide Cash Flow Dictionary Cash Flow Columns Gross Margin (MARGIN_GROSS) Data Verification Requirements and Suggested Defaults 8.2.53.3 Data Verification Requirements and Suggested Defaults For Fixed Rate Accounts, MARGIN_GROSS = 0. For Adjustable Rate Accounts with no contractual margin, MARGIN_GROSS = 0. For Administered Rate Accounts, MARGIN_GROSS = 0.