#N/A displayed when Lookup Formula is copied
 

Hello

I have a lookup formula in D10 that looks up to range D75:D86 & displays the
most recently entered (percent) value in the range:

=IF(ISNA(LOOKUP(2,1/D75:D86,D75:D86)),"",LOOKUP(2,1/D75:D86,D75:D86))

This formula displays the correct value.

When I copy this formula to cells E10:H10, amending the range as required,
#N/A is displayed. There are curently values in cells E75:E77 but not in
E78:E86. (This is the same as D75:D86.)

Don't know if this is relevant but cells D75:E86 all contain the same array
formula, eg =IF(ISERROR('November 2007'!H9),0,'November 2007'!H9)

Does anyone know why this is happening please? All helps gratefully received.

Best wishes.

Rachael