id	definition
AA	Actual Amount
AB	Estimated Amount
AC	Negotiated Amount
AD	Mixed Amount
AE	Estimated Quantity
AF	Negotiated Quantity
AG	Actual Rate
AH	Estimated Rate
AI	Negotiated Rate
AJ	Mixed Amounts
AK	Mixed Quantities
AL	Mixed Rates
AM	Actual
AN	Estimated
AO	Negotiated
AP	Mixed