Details of Losses to be carried forward to future years, Income Tax

[Mohideen A]

An Individual assessee had long term capital loss for the A.Y 2012-13, 2013-14, 2014-15, 2015-16 & 2016-17. The income tax return was filed within due date and capital loss was carried forward till A.Y 2017-18. While filing ITR for A.Y 2018-29 the carried forward loss was not reported in "Details of Losses to be carried forward to future years" and the same was not rectified before March 2019.

1) During the current assessment year 19-20, can we claim the carry forward loss (which was not reported in previous year) and set off with capital gain of current year?

2) Is there any alternation solution in case if the above option is not feasible.

Your response is appreciated.

Thanks in advance