Anyway know of the consequences of having a ticket title as Mr when the person travelling is a Mrs for a LHR-BOM flight on 9W?

I have spoken with the airline who have issued the ticket and they are saying that there should be no issues and a cancel and reissue is not necessary. They have updated the PNR with this. How ever Jet says that they can see this in the PNR abut will not be responsible "if" denied boarding.

Could there be any issues with immigration or customs?