I added variable product with in stock. but when i select product from frequently bought together and select size and color attribute.. it show out of stock.. you check the link above
Thanks for reporting the issue. We are able to reproduce it. The team will work upon it and will release a fix in the upcoming update.
For now, you can use it with the following trick. You just need to define the stock quantity and it will work fine.
To add the stock quantity, please follow the steps :
1. Enable Manage Stock.
2. Add Stock Quantity.