urgent help need in case of transfer of business

Anmol Singla (808 Points)

03 July 2019  
There are two different businesses which are run by son and his mother under their GSTN.
There is transfer of business by mother to son due to her health issue and son want to use his mother trade name,
so application of core field amendment filed by transfree on 21st June 2019 and notice is received that firstly you have to cancel transferor GSTN.. So I make request for cancellation of gst on 28 June 2019, but as effective date of transfer is 21 June 2019, request for retrospective cancellation of gstn is made I.e. from 21june GSTN OF transferor get cancelled.
but transferor make gst invoices for period from 21 june to 30 June, what is the treatment of it I.e. now after getting approval whether we need to issue revise invoices of transferee gstn as gst invoices are already been issued from 21 to30 june and purchase has also been made in that period, please reply