I attached a file of a screw assembly.
I am adding this to another assembly.
After adding the screw, I right click on it in the design tree and click on disolve sub-assembly.
After this I get many mate errors.
When mating the screw assembly to the plate I use 1 concentric mate for body of screw and hole in plate.
I use 1 coincident multi-mate for plate and bottom of top washer.
I don't understand why I get mate errors.