I have a Joomla site, configured with virtuemart. My site is configured with "PHPSHOP_PRODUCT_FORM_WEIGHT_UOM_DEFAULT" => 'livres', in language/product/french.php. But it is not converting the livres to it's standard weight format, which result me the weight of the product as "0", for which tax is not calculating. Can any one help me to know, why this happen and how to resolve this. Any help is appreciable.