Delayed GSTR-1 Return by supplier

A user's supplier filed their March 2023 GSTR-1 late, meaning the invoices aren't appearing in the user's GSTR-2B. The user is asking if they can manually add the GST amount to claim input tax credit, especially since the amount is significant. The consensus is that input tax credit is generally only available if the invoices are auto-populated in GSTR-2B, as per Section 16(2)(aa) of the GST law.