As per the Income Tax rule, losses from business income (non-speculative) gets set off against IFOS income. And deduction under chapter VI-A is applicable on remaining incomes if any available. Hence in your case section, 80TTA is not being picked up OR being picked up partially since it is being set off against your non-speculative losses.  

Here is an article for your reference on the set-off of losses against Income from other sources.