Hi Rohan J Khandave,
As discussed with Vinayak Kulkarni, We have to handle this scenario in case of template type is change(i.e from row-wise to column-wise and vice versa), Scenario to handle is, Field which do not have implementation for column-wise template, Should get unmapped from row-wise template in case of change in template type(rowwise to columnwise) and vice versa.

CC-Rajendra Pawar, Ganesh Sadawarte, Vinayak Kulkarni, Satya