• Faker version: 30.8.2
• OS:

Then IBAN is almost correct, but contains wrong control number in the account number
for example IBAN generated by faker

https://nl.ibancalculator.com/iban_validieren.html

from faker import Faker
fake = Faker("nl_BE")
Faker.seed(0)
iban = fake.iban()

resulting BE48660487647593 has wrong control numbers in the account number
https://nl.ibancalculator.com/iban_validieren.html and here is some explanation about IBAN validation
arthurdejong/python-stdnum#62

I did some ugly monkey patching for my own use I can share my solution here when I will clean it and test