Tax Invoice vs GRN

Since you have received the material before the date of invoice, you will have to make Receipt Note (inventory) entry on receipt of goods on the basis of GRN and DC.

Once the invoice is received, make purchase entry against the receipt note

Supplier can dispatch goods on SALE-ON-APPROVAL basis, in which case, the supplier would have 6 months time to generate invoice. Probably the supplier would have missed to raise the invoice (or some other reason, not sure) and hence this situation I guess.

Even I meant the same.

How else can the mistake be corrected in this case?

The supplier has no option but to correct the mistake if it was forgotten to raise the invoice at the time of dispatch.

Yes, the purchaser will be able to avail ITC only after the date of invoice.

The practice by your supplier is very dangerous as far as legal aspects are concerned. No movement of goods can take place without invoice.

And no itc can be claimed until invoice is received.