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Changes between Initial Version and Version 1 of Ticket #1009, comment 12

initial	v1
1	1	From my current observation, as of this fix, creating a "Membership" or a "Notification Subscription" has become impossible between Username and Workspace as soon as any simple "dm4.core.association" already exists between these two.
2	2
3		~~Try to create a "Membership" association between a "Username" and a "Workspace" topic~~.
	3	An error is thrown to the user if one wants to create a "Membership" between a "Username" and a "Workspace" using the Webclient (when a simple assoc exists).
4	4
5	5	The only workaround is to retype the existing association to a "Membership" and re-creating the simple assocation which connected the two topics before. Is there a case we would want to disallow many simple associations between two topics? I do not think that "dm4.core.assocations" should be regarded as carrying "operational semantics."