how reduce B2c entry in next month?

Vijay Shiroya Adv (64 Points)

02 June 2018  
i had wrongly enter b2b bill Rs.10000/- as b2c in march gstr1. i will show this bill in April gstr1 as b2b. now my question is .i have no b2c bill in april month so how i reduce b2c value in April return.? can i show -10000(minus 10000) as b2c sales in april gstr1?