Stephane:
This is simply an oversight in the product design. When I pointed this out
to the product team some time ago, they were as surprised as you are now.
You can and should detach unwanted RPs from their respective project plans.
See:
http://www.projectserverexperts.com/ProjectServerFAQKnowledgeBase/DetachResourcePlan.aspx
Other than using a SQL query to purge the records, they will remain in the
database indefinitely. I hope to see Resource Plans included in database
management in the next version. After you upgrade, you'll be able to delete
them.
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Gary L. Chefetz, MVP
MSProjectExperts
Project Server Consulting:
http://www.msprojectexperts.com
Project Server Training:
http://www.projectservertraining.com
Project Server FAQS:
http://www.projectserverexperts.com
Project Server Help Blog:
http://www.projectserverhelp.com