SQl Error Upgrade to Business

Hi,
I have upgrade my release of Hikashop to Business version.
I installed the upgrade from Essential to Business but at the end of the installation an error appear:
"500 SQL=ALTER TABLE `h7eoh_hikashop_product` ADD `product_alias` VARCHAR( 255 ) NOT NULL DEFAULT '';"

and if I try to create a new product this is the error message:
"500 SQL=INSERT IGNORE INTO `h7eoh_hikashop_product` ( `product_name`,`product_url`,`product_meta_description`,`product_keywords`,`product_page_title`,`product_alias`,`product_canonical`,`product_code`,`product_tax_id`,`product_manufacturer_id`,`product_layout`,`product_quantity`,`product_min_per_order`,`product_max_per_order`,`product_sale_start`,`product_sale_end`,`product_msrp`,`product_weight`,`product_weight_unit`,`product_length`,`product_width`,`product_dimension_unit`,`product_height`,`product_published`,`product_access`,`product_group_after_purchase`,`product_type`,`product_description`,`product_modified`,`product_created` ) VALUES ( 'Test Leonard','','','','','','','Test_Leonard','11','0','','25','0','5','','','','','kg','','','m','','1','all','','main','retertert','1366911979','1366911979' )"

Can you help me to resolve this problem?
Thanks in advance!
Guy

Hi,
Thanks for your reply!
Now I'm working on a test site and I update my version of Joomla, then I run again the upgrade of Hikashop and no message error appear......but still does not work and also other article do not appear!
Please, before upgrade the site on "production", can you gime me the correct sequence to do correctly?
Thanks!
Guy

Hi,
I've probably solved the problem:
In test environment I uninstalled every single component and plugin of hikashop(filter Hika) then I dropped manually every tables of Hikashop on DataBase.
I have upgrade to latest versione of Joomla (3.1.0) and finally I installed every version of Hikashop (1-Starter,2-Essential and 3-Business) and no error appear and no problem when I try to publish a module/menu or create a new product.
For your opinion is correct this way? can I procede also in production environment?
Many thanks for your support!
Guy