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Lookup versus Master Detail Relationship on Milestone PM (To Reid)

Hello Reid,


i have a quick question:


Why you used Look up relationship, between, Milestone and Project and

a Master Details Relationship between Task and Milestone?


Thanks in Advance



Best Answer chosen by Admin (Salesforce Developers) 

Having a lookup allows you to have separate ownership rights between the project and milestone.  If you do a MD, you inherit everything from the top level project.    seemed like that was restricting at the project level, but OK at the milestone and task level.