Solid Element Operations not working with Polywall and Morph?

[dg2]

Hi

I'm modelling ruins and to create the walls I've been using the polywall tool. When I make a morph (in section then extruded in 3D) to then intersect it with the wall in using solid element operations, the wall disappears/cuts off? Im just trying to make the wall with a rough top... I select the wall as target and morph as operator. I've done it on the wall behind this one and that one worked fine (using same layers etc. as this time around). I've played around and tried making different morphs but nothing seems to be working? 

Thanks

[Lee Hankins]

I did exactly this to model some ruins but I created a complex profile beam to use for the solid element operations on each section of wall by tracing over the profile I wanted to create in elevation using lines and then pasted these in to the profile manager.