The difference is between what is called a liquidated and an unliquidated claim.
This left 141 billion dollars in unobligated authorizations and unliquidated obligations.
Most of the unliquidated obligations result from transactions booked during the war years.
If the amount of a claim is unliquidated the act sets forth the mode of proceeding.
1570s, "to reduce to order, to set out clearly" (of accounts), from Late Latin or Medieval Latin liquidatus, past participle of liquidare "to melt, make liquid or clear, clarify," from Latin liquidus (see liquid). Sense of "clear away" (a debt) first recorded 1755. The meaning "wipe out, kill" is from 1924, possibly from Russian likvidirovat. Related: Liquidated; liquidating.
[1924+; based on Russian likvidirovat, ''liquidate, wind up'']