Thank you for your suggestion. I have already filed the nil return for June 2023. As I understand I can not change it after the due date. What can I do now?
29 July 2023
Yes, Once filed we can't edit or revise.
If no outward then we can file nil GSTR 1.
If no outward and inward then we can file Nil GSTR 3B...
In Your case GSTR 3B will be file with inward details. But, You filed it Nil return then Next month's GSTR 3B not showing Your June's ITC details (as per GSTR 2b).