2.1.1043 Part 1 Section 22.214.171.1249, TBILLPRICE
a. The standard states that the function computes the price per $100 face value for a U.S. Treasury bill.
In Office, the function is not specific to any currency or treasury bill.
b. The standard states that if the settlement arguent is greater than the maturity argument, then #NUM! is returned.
Office returns #NUM! if the settlement argument is greater than or equal to the maturity argument.