Loan existed in balance sheet but payment made by unaccounted money. no source available

Harddik A Thakkar (Credit Analyst ) (101 Points)

08 December 2016  
Dear Sir/ Madam In the balance sheet of an individual, loan has shown, but the repayment was made by unaccounted money. How to deal with this loan in balance sheet. Person wants to remove it from balance sheet permanently. What accounting and taxation matters taken into account. Can it be shown as Defaulter? What compliance and consequences should be taken into account. Thanks a lot