woothemes / woocommerce

		$order->remove_order_items( 'tax' );

		// Add tax rows

		foreach ( array_keys( $taxes + $shipping_taxes ) as $tax_rate_id ) {

			$order->add_tax( $tax_rate_id, isset( $taxes[ $tax_rate_id ] ) ? $taxes[ $tax_rate_id ] : 0, isset( $shipping_taxes[ $tax_rate_id ] ) ? $shipping_taxes[ $tax_rate_id ] : 0 );

		}

		// Create the new order_taxes

		foreach ( $order->get_taxes() as $tax_id => $tax_item ) {

		$this->remove_order_items( 'tax' );

		// Now merge to keep tax rows

		foreach ( array_keys( $taxes + $shipping_taxes ) as $tax_rate_id ) {

			$this->add_tax( $tax_rate_id, isset( $taxes[ $tax_rate_id ] ) ? $taxes[ $tax_rate_id ] : 0, isset( $shipping_taxes[ $tax_rate_id ] ) ? $shipping_taxes[ $tax_rate_id ] : 0 );

		}

		return true;

	}

		$this->remove_order_items( 'tax' );

		// Now merge to keep tax rows.

		foreach ( array_keys( $order_taxes + $order_shipping_taxes ) as $tax_rate_id ) {

			$this->add_tax( $tax_rate_id, isset( $order_taxes[ $tax_rate_id ] ) ? $order_taxes[ $tax_rate_id ] : 0, isset( $order_shipping_taxes[ $tax_rate_id ] ) ? $order_shipping_taxes[ $tax_rate_id ] : 0 );

		}

		// Save tax totals

		$this->set_total( WC_Tax::round( array_sum( $order_shipping_taxes ) ), 'shipping_tax' );