Option B: Branch of Sender/Receiver
[/1a][/34x] (Party Identifier)
When used, at least one line must be present.
An account number only, not followed by any other identification, is allowed (field 53a).
For field 52a, the field specifications for individual message types specify whether this option identifies a branch of the sender or the receiver.
In field 53a, this option specifies either the account to be debited or credited, or a branch of the sender, that is, of the financial institution specified in the sender's address in the header.
In fields 54a and 57a, this option specifies a branch of the receiver, that is, of the financial institution specified in the receiver's address in the header.