[Forums] Move entity from module to other one

I have created an UserExtensionModule to assign a manager to each exsisting User in "User/Roles" of my environment. I have referenced the UserExtended entity to the coreModule. But still there exists some problem in the matching of primarykey. How would we get the primary key of that particular user. Where i exactly want to use the manager is, if a user sends request it should be automatically intimated to the manager through mail. if i use "GetUserExtended(RequestTable.current.UserId).User.Manager", It shows "Key 0 not found". Please help me to fix this.