As per Section 31(3)(a) - a registered person may, within one month from the date of issuance of certificate of registration and in such manner as may be prescribed (Rule 53), issue a revised invoice against the invoice already issued during the period beginning with the effective date of registration till the date of issuance of certificate of registration to him;
Rule 53(2) - Every registered person who has been granted registration with effect from a date earlier than the date of issuance of certificate of registration to him, may issue revised tax invoices in respect of taxable supplies effected during the period starting from the effective date of registration till the date of the issuance of the certificate of registration:
Provided that the registered person may issue a consolidated revised tax invoice in respect of all taxable supplies made to a recipient who is not registered under the Act during such period:
Example: in Form REG-06 - Effective date of registration is 10th May 2020, although the registration certification was issued on 30th May 2020, then for such period, invoices can be raised with GST and after receiving the certificate, revised invoices with GSTIN could be raised.