Referencing more than 2 sheets in one cell function?

[Alex]

I am trying to take information from four different sheets in my workbook to
create one function in my fifth sheet. So far, the function works with
information from one sheet and two sheets but I cannot add the reference to
the third sheet to the funtion without errors.

 

[Rick Rothstein]

Perhaps if you showed us the code for the non-working function and described
in more detail what you have now on the four sheets and what you want the
function to output when it is done, then someone here may be able to offer
you some comments as to how you should proceed.

 

[Alex]

=SUM(--('Sheet1'!$B$2:$B$2000<=BB$3),--('Sheet1'!$B$2:$B$2000>=BB$2),--('Sheet1'!$D$2:$D$2000=$B7),
--('Sheet2'!$B$2:$B$2000<=BB$3),--('Sheet2'!$B$2:$B$2000>=BB$2),--('Sheet2'!$D$2:$D$2000=$B7),
--('Sheet3'!$B$2:$B$2000<=BB$3),--('Sheet3'!$B$2:$B$2000>=BB$2),--('Sheet3'!$D$2:$D$2000=$B7),
--('Sheet4'!$B$2:$B$2000<=BB$3),--('Sheet4'!$B$2:$B$2000>=BB$2),--('Sheet4'!$D$2:$D$2000=$B7))

Sheets 1-4 all list claims but they need to be seperated. The values that
are targeted in column B are the dates, and the function is intended to tally
the cumulative number of claims from the four sheets from the date specified
in BB2 to the date specified in BB3 (usually one month, like 3/1/01-3/31/10).
The formula works when I omit the reference for any two sheets, but not when
I attempt to reference four in one formula.

Thanks.