<(this is the old result, prior to updating the data)

Which data are you updating; A:A?

LOOKUP requires that the data is sorted ascending. Is that condition
satisfied?

LOOKUP is not used a lot anymore. As HELP says, it is provided for backward
compatibility.
Normally, one would use VLOOKUP.

BTW, did you check ToolsOptionsCalculation Tab and make sure Calculation
is Automatic?


--
Kind regards,

Niek Otten



"Linda Peters" wrote in message
...
Formula from spreadsheet 1: =LOOKUP(A27,Data!A:A,Data!L:L)
Expected result: 18165
Actual result: 18165

Formula from spreadsheet 2: =LOOKUP(A80,Data!A:A,Data!L:L)
Expected result: 18165
Actual result: 13665 (this is the old result, prior to updating the data)

In both cases, the value being looked up (in A27 & A80) are the same value
(an accounting code: 1-102-342-205-110)

--
Linda Peters


"Niek Otten" wrote:

<Any suggestions of what the problem might be?

Not without your formulas, input values, expected and actual results!

--
Kind regards,

Niek Otten

"Linda Peters" wrote in message
...
I have a rather large workbook with multiple uses of LOOKUP over a
variety
of
worksheets. In some cases, the LOOKUP of a particular value occurs only
on
one worksheet, in other cases LOOKUP of the same value may occur over
several
spreadsheets.

The problem I've run in to today is that when the data is updated, the
value
returned by LOOKUP may not be correct (it keeps the old value and
doesn't
replace it with the new one). In this particular instance, I used
LOOKUP
on
two different worksheets, both looking up values from the same table;
some
of
the values being looked up were the same, some were different.
Spreadsheet
1
updated to the new values when the data was changed, however
Spreadsheet 2
did not and kept the old value (which is now incorrect).

I was able to correct it by "re-doing" the LOOKUP formula on
Spreadsheet
2,
but that's not going to be very effective long term.

Any suggestions of what the problem might be?
--
Linda Peters