Residential sale agreement

A seller is concerned about a broker offering two sale agreements for a residential plot, one with a lower price for a bank loan and another with a higher price for the actual payment. The seller is questioning the legitimacy of this practice and whether they can refuse registration if the lower amount is paid. The advice suggests that there should only be one sale agreement and one registered amount for a transaction, and that a broker's agreement might only be permissible under specific circumstances.