This formula works correctly:

=SUMPRODUCT(--(AMS!$C$4:$C$60000="InitialOrderEntry");--(AMS!$Z$4:AMS!$Z$60000=17);--(AMS!$AB$4:$AB$60000=226);--(AMS!$AS$4:$AS$60000=$A$1))

When I add another condition --(AMS!$B$4:$B$60000=Summary!C3) the formula
returns zero - should return a number.

=SUMPRODUCT(--(AMS!$C$4:$C$60000="InitialOrderEntry");--(AMS!$Z$4:AMS!$Z$60000=17);--(AMS!$AB$4:$AB$60000=226);--(AMS!$B$4:$B$60000=Summary!C3);--(AMS!$AS$4:$AS$60000=$A$1))

What am I doing wrong.

Thank you in advance.