It is possible to assign resources to milestones and summary tasks.
It is also not recommended by people here in this newsgroup. Since
Milestones are of 0 duration, assigning a resource to them does not create
work or cost for the program.
If you assign resources to summary tasks, it is confusing to determine how
to allocate the work in the subtasks.
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Jim Aksel, MVP
Check out my blog for more information:
http://www.msprojectblog.com