Try this:

=IF(COUNT('Worksheet reference'!O12:X12),LOOKUP(1E100,'Worksheet
reference'!O12:X12),"")


--
Biff
Microsoft Excel MVP


"RPage@SF" wrote in message
...
Now it reports "#NA" if the value is zero, but correctly if there are
values
to be summed. How can I get it to report 0 if there isn't a value to
report?

"Gary''s Student" wrote:

We can force your LOOKUP() to work!!

In O12 you may have something like:
=SUM(O1:O11)
replace it with:
=IF(SUM(O1:O11)=0,"",SUM(O1:O11)) and copy across

This way if the SUM() reports a zero, we make it a blank and your
LOOKUP()
will be happy again.
--
Gary''s Student - gsnu200785


"RPage@SF" wrote:

I have a series of cells that sum the columns above them (O12:X12) on
multiple worksheets. I would like to write a formula to report the cell
that
has a value and is the furthest to the right. I used:

=LOOKUP(10^10,'Worksheet reference'!O12:X12)

This worked on a previous worksheet when the data range contained
values,
but since O12 through X12 include SUM formulas, it's not working.

Any ideas?