The Reserve Bank of India (RBI) put the onus of forming a Joint Lenders' Forum (JLF) on the bank with highest exposure to a distressed borrower and said on Tuesday that failure to do so would attract higher provisioning penalties for that bank alone.The RBI in a notification issued in Mumbai said that under revised norms, RBI has also tightened distressed asset sales to asset reconstruction companies (ARCs) saying that banks should first fulfil commitments made at the lenders' forum in case of a loan recast.According to RBI's new guidelines, if any lender has reported an account to the Central Repository of Information on Large Credits (CRILC) as special mention accounts (SMA2) accounts which are due for more than 61 days and a JLF has not formed or a corrective action plan (CAP) was not decided, then the bank with the largest exposure should pay the penalty for such a delay.The notification further says in case the lead bank does not form the JLF within the stipulated 15 days, the onus to do so would fall on the bank with the second largest exposure and the same disincentives as the lead bank would apply to it.