The regulation makes the provider accountable to the Sender for an error anywhere in the chain all the way to the receiving bank. Any ability of the provider to recover funds from those along the chain is dependent on the agreements (if any) between them. Chances are, you'll have some sort of contract with your correspondent, and it will have a contract with another correspondent, etc..
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8