Are you using the pierce mate? Can you post an example?
no ive been using coinicedent to try to pick the very ends so i can make a boundry surface which im asuming must be closed.
You will need to have pierce relations for the boundary curves.
You might want to ask about this in the SolidWorks/Surfacing forum, as the folks there are very familiar with Boundary Surfaces and Projected Curves.
will give the pierce relations ago
ill also post in the surfacing foum
One limitation of Project curve is that the either curve can not loop back on itself - even the slightest. In other words, if you have a 3 point spline on the top plane and the beginning and ends are coincident to the front plane but not normal but actually 91 degrees, and then you have a horizonal line on the front plane, if you use the two, then the projected curve will not extend fully because of the 1 degree at either end.