IDT 4.0 - Measure/#Multivalue error

Hi,

I have a measure in the IDT with the follwing syntax in the select part:

CASE WHEN CODE IN ('A','B','C') THEN @Select(Measures\Total) ELSE 0 END

When I drag this measure onto a webi document with a dimension it throws #multivalue error

Any help is appreciated

Thanks

Veena M