Is Bank Account Owner mandatory to populate the Bank details on AP payment schedules

For Oracle R12 12.2.9 instance, would like to know - 

1. when the bank account owner is not present on the bank account then AP payment schedule do not get external bank account id populated by default when we create invoice.
2. when we create record in bank account owner and try create new AP invoice, this time AP payment schedule would get the external bank account id populates by default. 

Is this bank account owner mandatory in R12 12.2.9 version. On 12.1.3 version, this was not the case. even without having account owner, we use to have external bank account id populate on AP payment schedule.