I am trying to add amounts from one workbook (Invoices) based on 3 criteria
and put the total in a second workbook (Jones cost control).
I have the following formula copied down the Total Paid column.

=SUMPRODUCT('[RICHs DESKTOP.xls]Invoices'!$H$4:$H$65536=$B6)*('[RICHs
DESKTOP.xls]Invoices'!$F$4:$F$65536=$B$2)*('[RICHs
DESKTOP.xls]Invoices'!$O$4:$O$65536="X")*('[RICHs
DESKTOP.xls]Invoices'!$I$4:$I$65536).
In the above formula Invoices H=Phase, Invoices F=Job, Invoices O=Paid (X) &
Invoices I=Amount. The formual is in Jones cost control Total Paid column.



Invoices
Jones Cost Control
Job Phase Paid Amount Phase
Total Paid

Jones 5.1 x 1,000
4.2 400 (S/B)smith 5.1 x 500
5.1 1,250
Jones 4.2 x 400
Jones 4.2 600
Jones 5.1 X 250
Jones 5.1 700

It worked at one time. what is wrong with it? I'm not getting a formula
error...just a blank cell where the total should be.

Help. Thanks,