tax invoice

As per My view.,

No more provisions for send goods without Invoices...

As per section 31(7)-

Notwithstanding anything contained in sub-section (1), where the goods being sent or taken on approval for sale or return are removed before the supply takes place, the invoice shall be issued before or at the time of supply or six months from the date of removal, whichever is earlier.

Thus, invoice should be issued before or at the time of supply or 6 months from the date of removal, whichever is earlier.