is digital signature is compulsory for filing ITR 3 ?

Dear Sir,
We have GSTR1 return for the month of July-17. In that return we mentioned wrong GSTN no of our one party. How to rectify the said GSTR 1 return.
Thanks.
Regards,
Kiran

Mr.X Sold (1.12.2014) a residential plot Rs 30lakh.cost of acquisition with indexationRs. 573465. Deposited in August 2015 Rs 30 lakh in LTCGA. House could not be purchased/constructed. Suffered loss of Rs 40000 on account of deduction of EMD by a Govt. housing board. Please Guide: tax liability, withdrawal from the account and closure of LTCGA.
with regards.
R.K.Arora

A bill is issues in the month APRIL 2017 by us to a customer and service tax has been collected same is deposited in account of service tax department but bill is cancelled in GST period so no tax liability arise on the bill.So please suggest me the treatment of SERVICE TAX which is already paid to government in GST regime.

CAR RENTAL SERVICE PROVIDER IS REGISTER UNDER GST REGULAR AND NOW HE PROVIDE SERVICE TO RECEIVER ON CAR RENT MONTHLY BASIS WITH DRIVER AND FUEL CHARGES AND CHARGE 12% GST RATE
NOW SERVICE PROVIDER CAN CLAIM ITC OF REPAIRING OF CAR AND NEW PURCHASE ON CAR GST TAX. PAID BY SERVICE PROVIDER.

Need expert opinion , have Huge income in the head of Other income - Interest income on loan given - suggest me how to reduce tax liability . EXCEPT SECTION 80C,80D I.E ( CHAP VI - A DEDUCTION ) .

Office space shared by A & B companies . Expenses incurred like Rent, electricity expenses , staff welfare, repairs and maintenance extra shared in proportion 50: 50 basis. The payment made by A company and raise debit note to B company for reimbursement of expenses. A company raise the debit note with GST for the same ? GST applicable on reimbursement of expenses ?

Can a individual take gift from Cousin (uncle's son)?

If in purchase invoice , it is written as
Total. : 600000
(+) Freight advance : 10000
Grand total. : 610000
( This is the purchase invoice )
My query is that in p/l we will transfer 610000 to purchases or only 600000 ??

if in purchase invoice,
total : 600000
(+) freight advance: 10000
grand total : 610000

then , that 610000 should be the purchases or only 600000 will come in P/L ??