Zag2009

If a government prime contractor issues a Time & Material subcontract, can the G&A applied to materials be a fixed/lump sum value, so long as that lump sum value is established and set at the time of award? I understand the four criteria established in Urban Data System v. US, but I am trying to determine if the only way to surely avoid violation is to reconcile the G&A rate applied to materials to actuals at the close of an accounting period.