If you attempt to offer free shipping with MVS you will get ERROR_NO_SHIPPING_SELECTED_SELECTED. To fix this problem, open vendor_shipping.php, located in includes/modules.

Replace

<td class=”main” width=”100%”><?php echo sprintf(FREE_SHIPPING_DESCRIPTION, $currencies->format(MODULE_ORDER_TOTAL_SHIPPING_FREE_SHIPPING_OVER)) . tep_draw_hidden_field(‘shipping’, ‘free_free’); ?></td>

with

<td class=”main” width=”100%”><?php echo sprintf(FREE_SHIPPING_DESCRIPTION, $currencies->format(MODULE_ORDER_TOTAL_SHIPPING_FREE_SHIPPING_OVER)) . tep_draw_hidden_field(‘shipping_’ . $vendor_id, ‘free_free_0′) . tep_draw_hidden_field(‘products_’ . $vendor_id, implode(“_”, $products_ids));?></td>