Where the recipient has modified/deleted/added any details in his FORM GSTR-2, the supplier will receive a communication in FORM GSTR-1A. The supplier can accept or reject such modifications/deletions/addition before 17th of the succeeding period. If the supplier accepts the modifications/deletions/addition, the details furnished by him in
FORM GSTR-1 will be amended automatically.
(ICAI FAQ PUBLICATION 06-09-2017 -: Returns : FAQ NO. 8)