[mso] Question on SUMPRODUCT formula

I was using SUMIF on a monthly report using Excel 2003.
ex.
Column A: Month
Column B: Name
Column C: Amount
Column D: Target

=SUMIF(A:A,Data!B1,C:C)

Another condition was added, so I changed SUMIF to SUMPRODUCT
=SUMPRODUCT((A:A=Data!B1)*((B:B=Data!C1))*(D:D))

And this returned a #NUM error.

However, when I entered specific number to rows, correct data appeared on 
the cell.
e.g., =SUMPRODUCT((A1:A20=Data!B1)*((B1:B20=Data!C1))*(D1:D20))

I cannot enter specific row numbers, as they change each month.

Is there any way of adding multiple conditions without specifying row 
numbers?

Thank you for your help.
Tomoko Okayasu
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