When I try to create a split line feature using a surfaceintersection, I get an error 99% of the time. Almost every time itsays, "cannot create an edge which does not split a face".Occasionally it says "trim tool and target are notintersecting....blah blah" even though they most definitely are.

I have to add 3-4 features to work around this every time, which isunacceptable. I use my workaround 4-5 times daily, at a minimum.

I had this problem about 25% of the time in 2008, and it has gottenworse since then. I cannot recall if this has ever worked in 2009.I am on 2009 sp 2.1.

What bugs the most is that one may clearly see that the surface isfully intersecting, but SW can't figure it out.

After some testing, I have narrowed this bug down to 1 case: whenboth the tool and target surfaces have more than one face, splitfails every time. If either tool or target is a single face body,the split will work. Otherwise, one must select one face on thetarget body per split feature, which is cumbersome and inefficient.Since very few of my surfaces have only one face, this bug bites meevery time I need a surface split.

I attached some images for this, as well as a sample part file withsome arbitrary surfaces. Try to split the multi-face pair, and tellme what happens!SolidworksSurfacing