Gst on rcm transactions entries

For the month of July-2017, we have a liabilty under RCM. 

that we have shown on 31.7.17 by raising liability & creating asset account.

Tax on RCM Dr 

 CGST Cr

SGST Cr

we paid the amount on 20.8.17 by debiting GST ledgers through bank 

for increasing input tax credit passed jv as CGST Dr

                                                                    SGST Dr

                                                                    Tax on RCM Cr.

please advise the correct accounting effect to be given.