KERML — Specify default direction for the ownedParameterMember of a ParameterMembership

The validateParameterMembershipParameterHasDirection constraint requires that the ownedMemberParameter of a ParameterMembership have a non-null direction – which is what makes it a parameter. However, it does not specify what the direction should be.

Now, for a ReturnParameterMembership, the validateReturnParameterMembershipParameterHasDirectionOut requires that the direction be out. The validateParameterMembershipParameterHasDirection should be updated so that, for a non-return parameter, the default direction is in.