@Override
 public List<Association> getAssociations() {
   return Collections.singletonList(
       new Association()
           .setName(ASSO_SYNC_COLLECTION.getName())
           .setEnd1(
               new AssociationEnd()
                   .setType(Model.COLLECTION.getFullQualifiedName())
                   .setRole(ROLE_SYNC_COLLECTION)
                   .setMultiplicity(EdmMultiplicity.ZERO_TO_ONE))
           .setEnd2(
               new AssociationEnd()
                   .setType(getFullQualifiedName())
                   .setRole(ROLE_COLLECTION_SYNCS)
                   .setMultiplicity(EdmMultiplicity.MANY)));
 }