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public function recalculate_totals(){
	// TODO
	
	$ot_subtotal = new Orderstotal();
	$ot_subtotal->orders_id = $this->orders_id;
	$ot_subtotal->class = Orderstotal::CLASS_SUBTOTAL;
	$ot_subtotal->title = 'Zwischensumme:';
	$ot_subtotal->value = $this->get_products_price_total_from_orders_products();
	$ot_subtotal->text = number_format( $ot_subtotal->value, 2, ',', '' ). ' EUR';
	//$ot_subtotal->save();
	
}