2D Drawing dimension measuring 3D space

Everyone,

I have a problem I hope someone can help me with. When I measure from a line to a centre mark (centre of a tooling ball sphere) the dimension should read 20mm, but it's actually showing 44,72 (see LH image). So I created another view and measured from the edge of the block to the sphere centre and I realized the 44,72 is a 3D dimension (see RH image). Has anyone come accross this before? Is there a toggle for this?

This is not good, I don't know which dimensions are correct and which are measuring 3D space!!??

Using SW2011 SP3

Regards

Dave

SolidworksDrawings And Detailing