Just need little help,If I stay on checkout page and product is out of stock and if I process further step, magento automatically redirect cart page,now I want to find where is code in core files which is match product quantity and if qty is 0 or out of stock it redirect cart page,Just help me to find that code which is redirect cart page from
onepage checkout if product is
out of stock
I found in core files but still not find code which is redirect cart page from
onepage checkout page.Please give me a hint please help me.