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I request to explain me ,

what is "external_bank_account_id" in AP_payment_schedules ?
Is this "external_bank_account_id" related to "bank_account_id" in ap_bank_accounts_all ?
Also, is this "external_bank_account_id" related to "external_bank_account_id" in ap_bank_Account_uses_v ?

External Bank Account Id is the Bank Account Id for a supplier's Bank.
In AP, there is functionality to define suppliers and suppliers' Bank Accounts.
So the external bank account in the ap_payment_schedules_all
table refers to the bank account where the payment will be remitted to the supplier