common/services/entities/NewsletterMemberService.php
public function create( $model, $config = [] ) {

		if( empty( $model->siteId ) ) {

			$model->siteId = Yii::$app->core->site->id;
		}

		return parent::create( $model, $config );
 	}
public function create( $model, $config = [] ) {

		if( empty( $model->siteId ) ) {

			$model->siteId = Yii::$app->core->site->id;
		}

		return parent::create( $model, $config );
 	}
public function create ( $ model , $ config = [ ] ) { if ( empty ( $ model -> siteId ) ) { $ model -> siteId = Yii :: $ app -> core -> site -> id ; } return parent :: create ( $ model , $ config ) ; }
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Create -------------