docs: private void registerNonExists(
  		final org.hibernate.engine.spi.EntityKey[] keys,
  		final Loadable[] persisters,
  		final SharedSessionContractImplementor session) {
  
  		final int[] owners = getOwners();
  		if ( owners != null ) {
  
  			EntityType[] ownerAssociationTypes = getOwnerAssociationTypes();
  			for ( int i = 0; i < keys.length; i++ ) {
  
  				int owner = owners[i];
  				if ( owner > -1 ) {
  					org.hibernate.engine.spi.EntityKey ownerKey = keys[owner];
  					if ( keys[i] == null && ownerKey != null ) {
  
  						final PersistenceContext persistenceContext = session.getPersistenceContext();
  
  						/*final boolean isPrimaryKey;
  						final boolean isSpecialOneToOne;
  						if ( ownerAssociationTypes == null || ownerAssociationTypes[i] == null ) {
  							isPrimaryKey = true;
  							isSpecialOneToOne = false;
  						}
  						else {
  							isPrimaryKey = ownerAssociationTypes[i].getRHSUniqueKeyPropertyName()==null;
  							isSpecialOneToOne = ownerAssociationTypes[i].getLHSPropertyName()!=null;
  						}*/
  
  						//TODO: can we *always* use the "null property" approach for everything?
  						/*if ( isPrimaryKey && !isSpecialOneToOne ) {
  							persistenceContext.addNonExistantEntityKey(
  									new EntityKey( ownerKey.getIdentifier(), persisters[i], session.getEntityMode() )
  							);
  						}
  						else if ( isSpecialOneToOne ) {*/
  						boolean isOneToOneAssociation = ownerAssociationTypes != null &&
  								ownerAssociationTypes[i] != null &&
  								ownerAssociationTypes[i].isOneToOne();
  						if ( isOneToOneAssociation ) {
  							persistenceContext.addNullProperty( ownerKey,
  									ownerAssociationTypes[i].getPropertyName() );
  						}
  						/*}
  						else {
  							persistenceContext.addNonExistantEntityUniqueKey( new EntityUniqueKey(
  									persisters[i].getEntityName(),
  									ownerAssociationTypes[i].getRHSUniqueKeyPropertyName(),
  									ownerKey.getIdentifier(),
  									persisters[owner].getIdentifierType(),
  									session.getEntityMode()
  							) );
  						}*/
  					}
  				}
  			}
  		}
  	}