ConstThe counterparty's own ledger account name, shown only within one customer.
The counterparty's name, projected from whichever counterparty key is set: the counterparty identity, then organization, then (within one customer) the counterparty ledger account's own name, then the counterparty customer, then the payment instrument's beneficiary, then the sender a deposit's rail reported. A FEE debit names the customer that collected the fee, and a withdrawal's RETURN names no one, whatever keys they carry.
Which source column is set, as the views' data_source.
The one selection every read of
b2b.transactionuses (docs/proposals/TRANSACTION_TABLE.md §2): stored columns, every foreign key as its external id, every name projected by a primary-key join, and every enum's description computed in SQL. Phase 0 reads it only in tests.