Doctrine delete items from collection - different column name - doctrine-orm

Question

I have problem with Doctrine collection. In PromoCodeTerm entity I have #OneToMany $days collection, but when doctrine delete items from this collection, generates SQL query with different column name, like a promoCodeTerm instead of promo_code_term_id.
class PromoCodeTerm {
/**
* #var string
* #ORM\Column(name="id", type="guid")
* #ORM\Id()
*/
private $id;
/**
* #var PromoCodeTermDay[]
* #ORM\OneToMany(targetEntity="AppBundle\Entity\PromoCode\PromoCodeTermDay", mappedBy="promoCodeTerm", cascade={"persist"}, orphanRemoval=true)
*/
private $days;
}
class PromoCodeTermDay {
/**
* #var integer
* #ORM\Column(name="day_id", type="integer")
* #ORM\Id()
*/
private $day;
/**
* #var PromoCodeTerm
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\PromoCode\PromoCodeTerm", inversedBy="days")
* #ORM\JoinColumn(name="promo_code_term_id", referencedColumnName="id", onDelete="CASCADE")
* #ORM\Id()
*/
private $promoCodeTerm;
}
What am I doing wrong?
An exception occurred while executing 'DELETE FROM `promo_code__promo_code_term_day` WHERE `day` = ? AND `promoCodeTerm` = ?' with params [1, \"c2fce03a-0507-47ca-a060-362cce683b06\"]:\n\nSQLSTATE[42S22]: Column not found: 1054 Unknown column 'promoCodeTerm' in 'where clause'