Credits not in GSTR 2A.Where to show reversal in GSTR 9

Respected CCI Members,

ITC is not reflected in GSTR 2A.But one of my client failed to reverse the same before March 2019.Now, kindly advise me about, WHERE TO SHOW THAT ITC IN GSTR 9.So that that amount can be paid through DRC 3 challan.

Thanks and Regards,
Dhebek M N