As per your valuable advice, all missing outward taxable supplies successfully enter in GSTR 1 for the month of August, 2019 on 19.10.2019 & filed return
and also enter missing supplies in GSTR 3B for the month of July, 2019 & paid tax with interest & filed return
please note our GSTR 3B pending for the month of Aug & Sep 2019 & GSTR 1 for Sep 2019
Portal not accepted interest calculation on net liability