Field help (TPYDACBID) @ L.V. Expertise X3

Use this field to enter the debtor's bank account number. This information is mandatory for electronic payment transactions.

When the transaction type is Receipt, the bank account number is initialized with the first Customer type bank account number found in the BP record. If this number does not exist, the default bank account number is used.
When the transaction type is Expense, the bank account number is initialized with the first Supplier type bank account number found in the BP record. If this number does not exist the default bank account number is used.
When the transaction type is "unspecified", the default bank account number that is initialized.

If the activity code VII (International transfers) is active, you can open a window to enter additional information (on other paying banks or intermediary banks) from the field containing the country code of the bank account number.