public function validateParentChain( $attribute, $params ) {

		if( !$this->hasErrors() ) {

			if( isset( $this->parentId ) && $this->parentId > 0 && $this->parentId == $this->id ) {

				$this->addError( $attribute, Yii::$app->coreMessage->getMessage( CoreGlobal::ERROR_PARENT_CHAIN ) );
			}
		}
	}