class Item(models.Model):
    title = models.CharField(
        'Наименование',
        max_length=30,
        default=' ',
        )
    countType = models.ForeignKey(
        ItemCountType,
        verbose_name='Тип исчисления',
        on_delete = models.CASCADE,
        )
    itemTypeChoices = (
        ("v", 'Расходный материал'),
        ("c", 'Инвентарь'),
        )
    itemType = models.CharField(
        'Тип',
        max_length=1,
        choices=itemTypeChoices,
        default='c',
        blank=True,
        )
    cost = models.FloatField(
        'Стоимость',
        default=0,
        blank=True,
    )

class ItemItemRelation(models.Model):
    alphaItem = models.ForeignKey(
        Item,
        verbose_name= 'Пополняемый расходник',
        on_delete = models.CASCADE,
    )
    omegaItem = models.ForeignKey(
        Item,
        verbose_name= 'Пополняющий расходник',
        on_delete = models.CASCADE
    )

data.ItemItemRelation.alphaItem: (fields.E304) Reverse accessor for 'ItemItemRelation.alphaItem' clashes with reverse accessor for 'ItemItemRelation.omegaItem'.
        HINT: Add or change a related_name argument to the definition for 'ItemItemRelation.alphaItem' or 'ItemItemRelation.omegaItem'.
data.ItemItemRelation.omegaItem: (fields.E304) Reverse accessor for 'ItemItemRelation.omegaItem' clashes with reverse accessor for 'ItemItemRelation.alphaItem'.
        HINT: Add or change a related_name argument to the definition for 'ItemItemRelation.omegaItem' or 'ItemItemRelation.alphaItem'.