TDS deduction

Dear all,

Suppose as on 30th April,2017,an vendor provided catering services for an amount Rs. 25,000.I have not deducted TDS for the above.I made the full payment.The same vendor provided catering services for an amount 85,000 as on 30th Nov,2017.Should I need to deduct TDS only on 85,000 or on the amount 1,10,000(85,000+25,000).If it is 1,10,000 ,what should i do as i already made the full payment rs.25,000 for the earlier service.Please resolve my query.

Thanks all