Sorry to post like this but I cannot see what is wrong with the following
nested VLOOKUP formula.

=IF(ISNA(VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]UK+Irish_Sterling'!$A:$G,2,0)),
IF(ISNA(VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]Irish_Euros'!$A:$G,2,0)),
IF(ISNA(VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]Export_Sterling'!$A:$G,2,0)),
IF(ISNA(VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]Export_Euros'!$A:$G,2,0)),
IF(ISNA(VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]Export_US_Dollars'!$A:$G,2,0)),
VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]Export_US_Dollars'!$A:$G,2,0)),
VLOOKUP($B$3,'C:\Calibration Masters\[Accounts.xls]Export_Euros'!$A:$G,2,0)),
VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]Export_Sterling'!$A:$G,2,0)),
VLOOKUP($B$3,'C:\Calibration Masters\[Accounts.xls]Irish_Euros'!$A:$G,2,0)),
VLOOKUP($B$3,'C:\Calibration
Masters\[Accounts.xls]UK+Irish_Sterling'!$A:$G,2,0))

If the contents of B3 are on any sheet except
[Accounts.xls]Export_US_Dollars the formula returns the correct data. If B3
is on [Accounts.xls]Export_US_Dollars the formula returns FALSE.

The Export_US_Dollars worksheet has just been added, hence the change in
formula, it worked fine before. Can anyone point me in the right direction?