One GSTR 1 monthly, One GSTR 1 quarterly

I habe two GST registration in Maharashtra because of two business vertical. One has turnover above 1.5 crore. Other have quite less than 1.5 crore.

So, shall i file both Entity GSTR 1 monthly or one quarterly and one monthly?


It will be appreciated if you could quote provision, rules, notification along with your answer.