if (fromConfig.isUsingAsCollateral(reserveId)) {
    if (fromConfig.isBorrowingAny()) {
        ValidationLogic.validateHFAndLtvERC20(
            reservesData,
            reservesList,
            usersConfig[params.from],
            params.asset,
            params.from,
            params.reservesCount,
            params.oracle
        );
    }

    if (params.balanceFromBefore == params.amount) {
        fromConfig.setUsingAsCollateral(reserveId, false);
        emit ReserveUsedAsCollateralDisabled(
            params.asset,
            params.from
        );
    }

    //@audit collateral is automatically turned on for receiver
    if (params.balanceToBefore == 0) {
        DataTypes.UserConfigurationMap
            storage toConfig = usersConfig[params.to];

        toConfig.setUsingAsCollateral(reserveId, true);
        emit ReserveUsedAsCollateralEnabled(
            params.asset,
            params.to
        );
    }
}
