It looks OK.
could the "GDS" cells have trailing or leading spaces ?
try

=IF(SUMPRODUCT(--(Trim(TCS!$E$2:$E$1000)="GDS"),--(TCS!$Z$2:$Z$1000=H2),--(TCS!$AA$2:$AA$1000<""))<0,SUMPRODUCT(--(TCS!$Z$2:$Z$1000=H2),--(TCS!$AA$2:$AA$1000<"")),"")



"s2m via OfficeKB.com" wrote:

The number that is calculated is correct if I do not use (--(TCS!$E$2:$E
$1000="GDS"). Do I have the brackets in the right place?


=IF(SUMPRODUCT(--(TCS!$E$2:$E$1000="GDS"),--(TCS!$Z$2:$Z$1000=H2),--(TCS!$AA
$2:$AA$1000<""))<0,SUMPRODUCT(--(TCS!$Z$2:$Z$1000=H2),--(TCS!$AA$2:$AA
$1000<"")),"")

Thanks

Sharon

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