Mumbai: Areion Group has formally sought the endorsement of the Reserve Bank of India (RBI) for its proposed ₹936-crore takeover of the fraud-hit mortgage lender Aviom India Housing Finance, with sources saying the regulator's 'fit-and-proper' assessment for the acquisition will likely involve extensive scrutiny beyond mere commercial considerations.RBI is expected to closely scrutinise the source of funds, governance track record and ownership structure behind Areion Group's proposed acquisition, announced four months ago, as part of its fit-and-proper assessment, said the sources cited above.Also Read: Areion Group wins Rs 936-crore bid for Aviom India Housing Finance despite higher Unity SFB offer"The regulator's focus will be on tracing the source of capital and ensuring the acquisition is backed by clean, identifiable funds," a person aware of the process said.Areion Group did not respond to ET's queries.