Excess Turnover in GSTR 1 of Mar.18

Dear Sir, As per my understanding its like since you entered excess turnover you paid the tax excess. If the Payment alone done in excess will not harm anything the balance will be on your cash ledger which you may utilize in future months, but due to the mistake holding the other liability which is payable is not correct. Since GSTR-3B option hasnot given so far... we need to wait  Presently you need to pay the balance liability, irrespective of mistake done in past months in my view, because willful misstatements will lead to unneccesary notice, clarifications etc.Please go through Sec. 73 of CGST Act.

yes Report exempted turnover as per books..... In case of any notice in the future or if department wants clarification....
clarify the same to them mentioning the reason of difference...