SELECT `ПР`.`Np`
FROM `ПР`
WHERE `ПР`.`Np` NOT IN
(
    SELECT `ПР`.`Np`
    FROM `СЛ`
    JOIN `Р_Н` ON `Р_Н`.`Код` = `СЛ`.`Код`
    JOIN `ПР` ON `ПР`.`Np` = `Р_Н`.`Np`
    WHERE `ПР`.`Noo` <> `СЛ`.`No`)