Automated Receipt Handling for Credit Process reversing the receipts on which priority

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Once the Transaction is generated against sales order, Receipts are applied as per the payment made by customers. Sometimes, customer makes more than one payment against a single invoice. Hence, multiple applications are done over a transaction. In case, customer is returning the product,  referenced RMA is generated which is imported to AR using Import AutoInvoice ESS. 'Automated Receipt Handling for Credit' process is unapplying the applied receipts and then applying the Credit Memo against the Transaction. We want to understand on what basis/priority,  'Automated Receipt Handling for Credit' process will pick the receipt for reversal in case of more than one