// id_category_default is now for multishop

install-dev/upgrade/php/generate_root_category_for_multishop.php

@@ -13,6 +13,9 @@ function generate_root_category_for_multishop()
 		(0, 0, 1, NOW(), NOW(), 0)
 	');
 	$id = Db::getInstance()->insert_id();
+	// set vars config
+	Configuration::set('PS_ROOT_CATEGORY', $id);
+	Configuration::set('PS_HOME_CATEGORY', 1);
 
 	$langs = Db::getInstance()->executeS('
 		SELECT `id_lang`

install-dev/upgrade/sql/1.5.0.7.sql

@@ -31,3 +31,5 @@ CREATE TABLE `PREFIX_carrier_tax_rules_group_shop` (
 INSERT INTO `PREFIX_carrier_tax_rules_group_shop` (`id_carrier`, `id_tax_rules_group`, `id_shop`)
 	(SELECT `id_carrier`, `id_tax_rules_group`, `id_shop` FROM `PREFIX_carrier`, `PREFIX_shop`);
 ALTER TABLE `PREFIX_carrier` DROP `id_tax_rules_group`;
+
+ALTER TABLE  `PREFIX_product_shop` ADD  `id_category_default` INT( 11 ) UNSIGNED DEFAULT NULL;