Name the message: How a payment declares what it is
Read what the message does, then pick the code that does it.
Which message does this? Carries a customer credit transfer between financial institutions — the interbank leg of a payment where the debtor, the creditor, or both are non-bank customers.
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This drill is built from How a payment declares what it is — it rearranges material written and sourced on that page rather than asserting anything new, so every claim in it is checkable there.