MDX SCOPE question

Hi,

I have en MDX challenge that I need some help with.

In my cube I have 3 dimensions: Business Unit (BU), Customer and Project

I have a calculated measure called [Budg Inv Hours %] = [Measures].[Budg Inv Hours] / [Measures].[Budg Capacity]

What I would like to archive is when using this calculated measure together with my Customer and Project dimensions then instead of making the calculation it should return 1 ( = 100%) if the [Measure].[Num Hours] return a value for the customer or project and else it should return no value ( NULL )

I could just create 2 new calculation like IIF(([Customer].[Customer], [Measures].[Num Hours]) = 0, NULL, 1), but I would like to just keep the one calculation (to keep my cube simple for my users) and either by changing this calculation or using a SCOPE get the result I want – if it is possible.

I have tried with the following SCOPE, but this also make the calculation return 100% when using it together with my Business Unit
dimension which is not what I am looking for:

SCOPE ([Customer].[Customer]);
    [Measures].[Budg Inv Hours %] = (IIF(([Customer].[Customer], [Measures].[Num Hours]) = 0, NULL, 1));
END SCOPE;

Also tried this:

SCOPE ([Customer].[Customer].MEMBERS, [Measures].[Budg Inv Hours %]); 
    THIS = (IIF(([Customer].[Customer], [Measures].[Num Hours]) = 0, NULL, 1)); 
END SCOPE;

Can someone please guide me a little

Regards, Søren Damgaard Jensen Senior BI Consultant @ Norriq, DK