Date of bad debts recovered: contract date or amount got

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MADHU MITTAL (Querist)
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17 September 2017 Bad debt in the books of assesse was written off in Financial Year 31.03.2012 of Rs. 100000/-. During f.y ended on 31.03.2015 on 25.03.2015 a contract was executed between assessee and the borrower (whose debts was regarded as bad debt in f..y. 31.03.2012) that amount will be paid in F.y.01.04.2015 to 31.03.2016 by handing post dated cheques of different dates within F.y.01.04.2015 to 31.03.2016 totaling of Rs. One lakh those were duly passed.
Assessee on 25.03.2015 itself made entry by debiting the Debtor a/c of Rs. One lakh and Credited the Bad Debts Recovered account. Now it is being told that Bad debts recovered can not be credited on 25.03.2015 itself, because it is only the date of contract and it should have been credited during during F.y.01.04.2015 to 31.03.2016 totaling of Rs. One lakh when actually it was duly received.
Assessee has carried forwarded losses of more than Rs. one lakh and those can be set off only upto 31.03.2015.
Please guide what is the correct law.