https://www.dotnetzone.gr:443/cs/blogs/abekiaris/archive/2009/10/08/one-way-associations.aspxIf you are tired of writing both parts of an association or if you want to add an association to an object that you do not own check eXpand ’s ProvidedAssociation attribute. Creating OneTo Many public   class Employee:BaseObject {    elCommunityServer 2.1 SP3 (Build: 20423.1)