Window Boundary Cutting into 3D objects

[Anonymous]

Hi,
How can I stop these windows doing what they're doing in the picture?
They are cutting a chunk out of the top of that wall that you can see to the right of each window.

If it makes an difference, the window and the bit of wall that is being cut out is part of the same complex wall profile, but they shouldn't be doing that because the opening lines in the complex profile are set properly to just the left hand side.

Thanks.

[Anonymous]

You might have to split your complex profile into two parts. It looks like the window is extruding horizontally to cut the upstand wall.