Can't enter "chargeable under dtaa rate" income on sch si

Hi!

I've received dividend on shares traded in US. On the dividend income 25% tax is withheld in US. As per my understanding we are supposed to mention the dividend income under Schedule SI, "2. Chargeable under DTAA Rate" section in ITR-2 form and get a tax relief using Schedule TR. Even the heading of the column says "Section code (Serial nos other than Sl no 1,2 are autofilled)". In year 2014 ITR-2 form we can enter amount for "Income" and "Taxable Income after adjusting for Min Chargeable to Tax". But, for year 2015 entry in these cells are disabled.

I want to know:

1) Are there any change in rules that's why these fields are disabled?

2) When should I enter this dividend income?

Thanks for the help!