The following formula works fine:
=SUMPRODUCT(--(INDIRECT($AW$3&"!$BL1:$BL$6000")={"A"}),--(INDIRECT($AW$3&"!$O$1:$O$6000")="XN01"),(INDIRECT ($AW$3&"!$CI$1:$CI$6000")))

However, I cant seem to get the following to work:
=SUMPRODUCT(--(INDIRECT($AW$3&"!$BL1:$BL$6000")={"A","B"}),--(INDIRECT($AW$3&"!$O$1:$O$6000")="XN01","XR01"),(I NDIRECT($AW$3&"!$CI$1:$CI$6000")))

I need to be able to summarise (using a headcount indicator (1) in Column
CI) groups of people together who are in certain groups e.g. staff can be in
groups A,B or C in Column BL, and in groups XN01 or XR01 in column O.

The indirect function is used as there are monthly named sheets with similar
data in.

Thanks