Malgudi Express: From the pages of RK Narayan to the railway tracks of Mysore. - Vageesh

I have booked a ticket from nanded to yeshwantpur junction (Train no. 16593) for the date 10-05-2011 and as onward journey I have booked ticket from yeshwantpur junction to manglore central (Train no. 16515) for the date 11-05-2011(on 2nd ticket it is written that 'reservation slip invalid without original' ). Now due to some problems I have to cancel my onward journey i.e. from yeshwantpur junction to manglore central (Train no. 16515) on date 11-05-2011.
So my question is that if I cancel my second onward journey ticket (i.e. from yeshwantpur junction to manglore central (Train no. 16515) on date 11-05-2011)
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my first ticket ( i.e. nanded to yeshwantpur junction Train no. 16593 )also gets cancelled?If yes it would be great problem for me as there are no more available tickets for nanded to yeshwantpur junction (Train no. 16593) on 10-05-2011. Please someone help !!