A few weeks ago I had a similar problem with Synchronous parts too. I wasn' t able to access some of it's properties.
I had to redo my parts in Ordered mode to make them work. Do your parts really need to be in synchronous mode?
I wish that I understood this issue better. In my testing, I'm not seeing any issues. I wonder if I'm using a different workflow or if the parasolid file I'm testing with works differently. Do you have an example parasolid file that you were having trouble with that you can share with me to look at?
Here follows a sketch identical to the one I was having trouble with.
I was applying a protrusion and then making holes on it like in the picture bellow.
I received an error whenever I tryed to use the suppress property on the holes. When the sketch is ordered, everything works fine.
I know I am late on the discussion, but isn't the Suppress property not only supported in Ordered mode?
In Synchronous mode you have the Detach and Attach functionality. I believe, this might cause your problems with Suppress in Synchronous mode.
I didn't know the Detach and Attach functionality. The next time I deal with Synchronous files I'll try them.