IND AS Financials- few queries

I work in a car financing NBFC, and I had a few queries. Our company incurs dealer commission expense at the time the retail customer makes a purchase through our finance. The auditor's view is that the dealer commission expense be capitalised (i.e. included in the cost of tbe loan asset) and then amortised in SPL over the tenure of the loan? But is it not in the nature of prepaid expense/deferred exp and ideally be classified as non-financial liability?