If the OBC-NCL certificate is found to be invalid or not produced AND the candidate satisfies all other requirements AND the seat is allocated in OBC-NCL category, then

(i) Allocated seat will be cancelled.

(ii) The candidate will be considered for seat allocation as a GEN candidate in the subsequent round(s) of seat allocation (if any), provided all other criteria are satisfied.

So, instead of the reciept only you need to be with your OBC - NCL certificate.