law: Indian Contract Act, 1872 
  60. Application of payment where debt
  
  to be discharged is not indicated 
  Where the debtor has omitted to intimate, and there are no other
  
  circumstances indicating to which debt the payment is to be applied, the
  
  creditor may apply it at his discretion to any lawful debt actually due and
  
  payable to him from the debtor, whether its recovery is or is not barred by the
  
  law in force for the time being as to the limitation of suits.