Magento related items with custom options add to cart not working

In magento when i tried to add related items to cart it doesn't work. I have gone through some references and i found that it has problem only if it has custom options. Products without custom options work prefectly.

I hope it is common for all magento community editions. My Magento version is 1.5.0.1

I tried goole for this solution but no luck. I have also gone through the extensions but i couldn'开发者_如何学Pythont find one. Please advise. Thanks

Related products wont added in cart,because the customer has to choose proper option.For example,if size is custom option,value must be selected while adding to cart.That make sense right?