How to get difference between two annotate fields in django orm - django

Question

The problem is that with this approach, annotate ignores equal amounts, and if you remove distinct=True, then there will be duplicate objects and the difference will not be correct.
In simple words, I want to get the balance of the account by getting the difference between the amount in cash and the amount on receipts for this personal account
queryset = PersonalAccount.objects.select_related(
'apartment', 'apartment__house', 'apartment__section', 'apartment__owner',
).annotate(
balance=
Greatest(Sum('cash_account__sum', filter=Q(cash_account__status=True), distinct=True), Decimal(0))
-
Greatest(Sum('receipt_account__sum', filter=Q(receipt_account__status=True), distinct=True), Decimal(0))
).order_by('-id')
class PersonalAccount(models.Model):
objects = None
class AccountStatus(models.TextChoices):
ACTIVE = 'active', _("Активен")
INACTIVE = 'inactive', _("Неактивен")
number = models.CharField(max_length=11, unique=True)
status = models.CharField(max_length=8, choices=AccountStatus.choices, default=AccountStatus.ACTIVE)
apartment = models.OneToOneField('Apartment', null=True, blank=True, on_delete=models.SET_NULL,
related_name='account_apartment')
class CashBox(models.Model):
objects = None
number = models.CharField(max_length=64, unique=True)
date = models.DateField(default=datetime.date.today)
status = models.BooleanField(default=True)
type = models.BooleanField(default=True)
sum = models.DecimalField(max_digits=10, decimal_places=2)
comment = models.TextField(blank=True)
payment_items = models.ForeignKey('PaymentItems', blank=True, null=True, on_delete=models.SET_NULL)
owner = models.ForeignKey(User, blank=True, null=True, on_delete=models.SET_NULL, related_name='owner')
manager = models.ForeignKey(User, null=True, on_delete=models.SET_NULL, related_name='manager')
personal_account = models.ForeignKey('PersonalAccount', blank=True, null=True,
on_delete=models.SET_NULL, related_name='cash_account')
receipt = models.ForeignKey('Receipt', blank=True, null=True, on_delete=models.SET_NULL)
class Receipt(models.Model):
objects = None
class PayStatus(models.TextChoices):
PAID = 'paid', _("Оплачена")
PARTIALLY_PAID = 'partially_paid', _("Частично оплачена")
NOT_PAID = 'not_paid', _("Не оплачена")
number = models.CharField(max_length=64, unique=True)
date = models.DateField(default=datetime.date.today)
date_start = models.DateField(default=datetime.date.today)
date_end = models.DateField(default=datetime.date.today)
status = models.BooleanField(default=True)
status_pay = models.CharField(max_length=15, choices=PayStatus.choices, default=PayStatus.NOT_PAID)
sum = models.DecimalField(max_digits=10, decimal_places=2, default=0.00, blank=True)
personal_account = models.ForeignKey('PersonalAccount', blank=True, null=True,
on_delete=models.CASCADE, related_name='receipt_account')
tariff = models.ForeignKey('Tariff', null=True, on_delete=models.CASCADE)
apartment = models.ForeignKey('Apartment', null=True, on_delete=models.CASCADE,
related_name='receipt_apartment')