addAttribute('quote_item', 'base_tax_before_discount', array('type'=>'decimal')); $installer->addAttribute('quote_item', 'tax_before_discount', array('type'=>'decimal')); $installer->addAttribute('order_item', 'base_tax_before_discount', array('type'=>'decimal')); $installer->addAttribute('order_item', 'tax_before_discount', array('type'=>'decimal'));