=SUMPRODUCT(--(A1=L1:L9),--(B1=M1:M9),--(B1<=N1:N9),O1:O9)
.. it sticks a 0 regardless of the emp and date entered.

Your expression is ok. But probably the return col O contains text nums,
which sumproduct cannot evaluate.

You could try this more generic index/match equivalent (normal ENTER to
confirm will do, like the sumproduct) which will work regardless of whether
its nums, text or mixed data in the return col:
=INDEX(O2:O9,MATCH(1,INDEX((A1=L2:L9)*(B1=M2:M9)* (B1<=N2:N9),),0))

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Max
Singapore
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