I am attempting to install 4 package modules that are identical. I can insert and mate the first one but upon mating the subsequent ones I get an error message saying that I need to overwrite the existing mates.
It is not possible to perform mating different assemblies to different surfaces when those assemblies are not independent of each other. When these assemblies are under one parent assembly, it makes them attached to each other.
The solution is to make those assemblies independent and each be placed separately under the main Components assembly in the tree manager in parallel. This can be done easily in SolidWorks part of the project tree (drag each package out of the parent assembly of the parts in question and drop it on the main assembly. At this point it will be possible to perform the mates on individual assemblies.