ADJUSTMENT OF GST BILLS OF LAST YEAR

A supplier received an advance payment of 20 lakh, but they have not issued any invoices until March 2024.
                                
                                
                             Is it okay to create invoices with backdated March 2024 dates?
                                
                                
                             Can we include these invoices in the current month's GST return?
                                
                                
                             Will the limit of 50000 for Eway bills impact this adjustment?