Rectification xml

i filed my itr for AY 2019-20 and got my refund. later I came to know that my 26A was not updated and i missed some of my refund. for that i filed a revised itr but this time after the processing I got a notice 143 1 saying that i have some outstanding amount. later when I talked with the guy at cpc banglore. They asked me to file a rectification. Now when i go to rectification window i get lots of option and i don't know how my problem fits within those option. And please help me how to generate the rectification X M L.i have filed itr 2 times for the AY 2019-20.please help