one part vs two part flag tw contracts following contracts truly negotiated one part rates inclusive reservation commodity surcharges k 24194 pnm 0 1100 dth k 24568 enervest 0 2200 dth k 24654 ena 0 2175 dth way invoice system designed contracts identified one part automatically generate credits commodity reservation invoice however causes us underbill shippers rates bump max tariff demand rate past switched flag two part minimize amount manual invoice corrections schedulers briefing contracts beginning data conversion review process new ets contracts system correctly reflect contract negotiated therefore effective september 2001 invoices schedulers must remember delete credits commodity invoices also marketers need ensure input discounts commodity demand gri surcharges necessary guarantee tw overbill shippers bottom line make sure total amount invoiced reservation commodity invoices combined contracts rate listed contract maxdtq number days month questions process please contact thanks elizabeth