I have a Magento installation that I need customised so that a visitor cannot checkout unless thay have a multiple quantity of 6 items (6-12-18… bottles of wine) in their cart. This quantity can be any number of different bottles of wine, red, white etc…
Ideally and if possible I want this only to apply to one category (wine) so that other products are purchased the multiple quantity rule will not apply.
The cart functionality I need is almost the same as this example site: http://www….
