The reason for the behavior you are experiencing could be that the projects are not located in the same solution. In order for a project to appear in the Projects tab in the Reference Manager, it should be in the same solution as the project which would reference it.
That means that both the database updater project and the model project (WBSAccessModel) should be in the same solution. Please verify whether that is the case on your side. If the projects are not in the same solution you could add the model project to your updater project`s solution or vice versa as described in this MSDN article
For more information about configuring a project consuming an OpenAccess Model you could refer to our documentation about the subject
I hope this helps.
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