Fix error -- from RIM:

(0..*) Role :: player :: (0..1) Entity :: playedRole
The following constraint applies to this association:
Invariant (Role x) { not(x.played_by.equals(null)) or not(x.scoped_by.equals(null)) }
4.7 (0..*) Role :: scoper :: (0..1) Entity :: scopedRole
The following constraint applies to this association:
Invariant (Role x) { not(x.played_by.equals(null)) or not(x.scoped_by.equals(null)) }


Should be

(0..*) Role :: player :: (0..1) Entity :: playedRole
The following constraint applies to this association:
Invariant (Role x) { not(x.player.equals(null)) or not(x.scoper.equals(null)) }
4.7 (0..*) Role :: scoper :: (0..1) Entity :: scopedRole
The following constraint applies to this association:
Invariant (Role x) { not(x.player.equals(null)) or not(x.scoper.equals(null)) }

