duplicate content

hikashop has ability to add product to more than one category. when we do this we have two pages with same title and content, and this duplicate content, how can we prevent this?

Hi,

It's simple. Set the URL you prefer in the "canonical URL" setting of your product/category.
That way, search engines will reference only that one regardless of the one actually used by the customers to reach the product page and it won't flag the others as duplicate content.