Perhaps this will help :
Code:
=IF(SUMPRODUCT(([Check_IN.xls]EmployeeData!$A$2:$A$1256=$A2)*([Check_IN.xls]EmployeeData!$C$2:$C$1256=B$1)*[Check_IN.xls]EmployeeData!$D$2:$D$1256)=0,"NA",SUMPRODUCT(([Check_IN.xls]EmployeeData!$A$2:$A$1256=$A2)*([Check_IN.xls]EmployeeData!$C$2:$C$1256=B$1)*[Check_IN.xls]EmployeeData!$D$2:$D$1256))
pulled down and across.
SUMPRODUCT is an array formula in itself, so no CSE is needed. You'll find a nice explanation on this function at
http://www.xldynamic.com/source/xld....T.html#classic