// fix validation rules

classes/Carrier.php

@@ -463,6 +463,23 @@ class CarrierCore extends ObjectModel
 
 		return $carriers;
 	}
+	
+	public static function getIdTaxRulesGroupMostUsed()
+	{
+		return Db::getInstance()->getValue('
+					SELECT id_tax_rules_group
+					FROM (
+						SELECT COUNT(*) n, carrier_shop.id_tax_rules_group
+						FROM '._DB_PREFIX_.'carrier c
+						'.Shop::addSqlAssociation('carrier', 'c').'
+						JOIN '._DB_PREFIX_.'tax_rules_group trg ON (carrier_shop.id_tax_rules_group = trg.id_tax_rules_group)
+						WHERE trg.active = 1
+						GROUP BY carrier.id_tax_rules_group
+						ORDER BY n DESC
+						LIMIT 1
+					) most_used'
+				);
+	}
 
 	public static function getDeliveredCountries($id_lang, $active_countries = false, $active_carriers = false, $contain_states = null)
 	{

controllers/admin/AdminCarrierWizardController.php

@@ -672,7 +672,11 @@ class AdminCarrierWizardControllerCore extends AdminController
 		if (Shop::isFeatureActive())
 		{
 			$multistore_field = array(array('shop'));
-			array_splice($step_fields, 1, 0, $multistore_field);
+			$tmp = $step_fields;
+			$step_fields = array(1 => $tmp[1]) +  $multistore_field;
+			array_shift($tmp);
+			foreach ($tmp as $row)
+				$step_field[] = $row;
 		}
 
 		$rules = array();