I tried the following formula that contians all the correct conditions, but
comes up with an incorrect sum as the result.
=SUMPRODUCT(--(Invoices!B2:B2000='Wholesale
Orders'!B2:B2000))--(Invoices!F2:F2000=A2)--('Wholesale Orders'!F2:F2000)

"David Biddulph" wrote:

So those are the conditions which you should include in your SUMPRODUCT,
along with your 'Wholesale Orders'!F2:F2001 value (which doesn't need the
double unary minus if you are not trying to convert from Boolean to a
number).

But as we said earlier, your arrays need to be of the same length. You
can't go from 2 to 2001 in some parts and 2 to 2000 in other parts of the
same formula.