Hi:
IF(ISERROR(INDEX(Baze!$A$1:$D$1000, MATCH(B3,PSC_2016.xlsm!Sales_Party_Name,), MATCH(Formula!A2,Baze!$A$1:$D$1,))),0,INDEX(Baze!$A$1:$D$1000, MATCH(B3,PSC_2016.xlsm!Sales_Party_Name,), MATCH(Formula!A2,Baze!$A$1:$D$1,)))
You can also use if you have latest version of excel.
IFERROR(INDEX(Baze!$A$1:$D$1000, MATCH(B3,PSC_2016.xlsm!Sales_Party_Name,), MATCH(Formula!A2,Baze!$A$1:$D$1,)),0)
Thanks