private Collection<CollectableEntityObject<PK>> readDependants(CollectableMasterData<PK> clct) {
  if (clct == null) {
   return Collections.<CollectableEntityObject<PK>>emptyList();
  }
 
  Collection<CollectableEntityObject<PK>> lstclctmd = new ArrayList<CollectableEntityObject<PK>>();
  for(CollectableEntityObject<?> clcteo : clct.getDependantCollectableMasterDataMap().getValues(getEntityAndForeignKeyField().getDependentKey()))
    lstclctmd.add((CollectableEntityObject<PK>)clcteo);
 if (isHistoricalView() // must be an historical view of parent controller.
    ) { //&& !clct.getMasterDataCVO().getEntityObject().getDependants().getData(this.getEntityAndForeignKeyFieldName().getEntityName()).isEmpty()) {
   lstclctmd = CollectionUtils.transform(clct.getMasterDataCVO().getEntityObject().getDependents().getData(
     getEntityAndForeignKeyField().getDependentKey()),
 new CollectableEntityObject.MakeCollectable(CollectableEOEntityClientProvider.getInstance().getCollectableEntity(
       getEntityAndForeignKeyField().getEntity())));
  } else {
   if (lstclctmd.isEmpty() && clct.getId() != null) {
    final Collection<EntityObjectVO<PK>> collmdvo = (Collection<EntityObjectVO<PK>>) ((clct == null) 
      ? new ArrayList<EntityObjectVO<PK>>() 
      : MasterDataDelegate.getInstance().getDependentDataCollection(getCollectableEntity().getUID(), getForeignKeyFieldUID(), getSubForm().getMapParams(), clct.getPrimaryKey()));
 
    lstclctmd = CollectionUtils.transform(collmdvo, new CollectableEntityObject.MakeCollectable(this.getCollectableEntity()));
    clct.getDependantCollectableMasterDataMap().addValues(getEntityAndForeignKeyField().getDependentKey(), lstclctmd);
   }
  }
 return lstclctmd;
 }

private Collection<CollectableEntityObject<PK>> readDependants(CollectableMasterData<PK> clct) {
  if (clct == null) {
   return Collections.<CollectableEntityObject<PK>>emptyList();
  }
 
 if (isHistoricalView()) { // must be an historical view of parent controller.
   return readDependentsForHistoricalView(clct);
  } 
 
  IDependentKey dependentKey = getEntityAndForeignKeyField().getDependentKey();
 
  Collection<CollectableEntityObject<PK>> loadedDependents = RigidUtils.uncheckedCast(clct.getDependantCollectableMasterDataMap().getValues(dependentKey));
  if (!loadedDependents.isEmpty() || clct.getPrimaryKey() == null) {
   return new ArrayList<CollectableEntityObject<PK>>(loadedDependents);
  }
 
  final Collection<EntityObjectVO<PK>> collmdvo = MasterDataDelegate.getInstance()
   .getDependentDataCollection(getCollectableEntity().getUID(), getForeignKeyFieldUID(), getSubForm().getMapParams(), clct.getPrimaryKey());
 
  Collection<CollectableEntityObject<PK>> lstclctmd = CollectionUtils.transform(collmdvo, new CollectableEntityObject.MakeCollectable(getCollectableEntity()));
  clct.getDependantCollectableMasterDataMap().addValues(dependentKey, lstclctmd);
 
 return lstclctmd;
 }