Transaction data filter in script logic

Hello experts ,

Is it possible to  not to retrieve records with zero values in script logic .

For example below are the records in the cube .

1) acc1 ,entity1,category1,time1,200

2) acc2 ,entity1,category1,time1,0

2) acc3 ,entity1,category1,time1,400.

Bleow is my scoping of the script logic.

*Xdim_memberset Account = acc1,acc2,acc3

*Xdim_memberset Entity = entity1

*Xdim_memberset Category = category1

*Xdim_memberset Time = time1

*when ..

*end when

logic in *when gets applied to all accounts ,instead it should run for only accounts acc1 & acc3 .

Please let me know if  its possible.