Analysis :: Waterfall Hierarchy - Unary Operator Not Working In Ragged Utility Dimension

I have a disconnected utility dimension with the following data and a waterfall->subwaterfall hierarchy. I have ignore if same as parent set on sub water fall. The unary operator is assigned to the relevant level

WaterFall WaterFallUnary SubWaterFall SubWaterFallUnary

Opening ~ Opening ~
Price ~ Price ~
Total Composition ~ Composition L1 +
Total Composition ~ Composition L2 +
Total Composition ~ Composition L3 +
Total Composition ~ Composition L4 +
Total Composition ~ Composition L5 +
Closing ~ Closing ~

I'm using MDX to set values to the members

SCOPE(Measures.Waterfall,[Dim Waterfall].[Water Fall].&[Price]);
THIS=Measures.LowestPrice;
END SCOPE;
SCOPE(Measures.Waterfall,[Dim Waterfall].[Sub Water Fall].&[Composition L1]);
THIS=Measures.[Composition L1];
END SCOPE;

[Code] ....

But when i run a simple select query

SELECT
{[Measures].[Waterfall]} ON COLUMNS,
[Dim Waterfall].[Water Fall].[Water Fall] ON ROWS
FROM [GPA]

I only get a value for price. Total Composition is NULL. If I change my query to look at the subwaterfall level then I see values for composition L1->L5, so I know there are values there I was expecting the unary operator to aggregate my composition measures into Total Composition.

I should point out that every measure that's being assigned to my utility dim is calculated with in excess of a dozen or so steps and intermediate calcs, is this causing some kind of solve order issue?

I know that as a workaround i could probably do something like

SCOPE(Measures.Waterfall,[Dim Waterfall].[Water Fall].&[Total Composition]);     
    THIS=SUM([Dim Waterfall].[Hierarchy].[Water Fall].&[Total Composition].Children,Measures.Waterfall);     
END SCOPE;

But that defeats the purpose of the unary operators

This is sql server 2014 multidimensional