Reclaim of ITC earliear reversed under Rule 42 of GCST Act - Goods and Services Tax - GST

Dear Members, I have a query related to Rule 42 of CGST Act, 2017 I transfer some amount of credit to permanent reversal under column 4B (1) of GSTR 3B due to the fact that input will used for exempt supply now the fact has changed and those supply will be considered as taxable. Now i wanted to reclaim the reversed ITC. Am i eligible to reclaim it ? If yes, What document i need to be have with me?