A licensee that finances, lends money, or otherwise makes advances of money or credits to another licensee may not deduct from the proceeds of any farm product which is marketed, sold, or otherwise handled by him on behalf of or for the account of the licensee to whom such money, loans, advances or credits are made, an amount which exceeds a reasonable commission or brokerage, together with the usual and customary selling charges or costs of marketing, or both. He may not otherwise divert to his own use or account or in liquidation of such loans, advances, or credits the moneys, returns, or proceeds accruing from the sale, handling, or marketing of any farm product which is handled by him on behalf of or for the account of the licensee to whom or for whom such loans, advances, or credits are made.