Mandatory
This field contains a reference common to both the Sender and the Receiver.
This field consists of the bank and location codes (Error code(s): T95) (from the ISO Bank Identifier Code) of both the Sender and the Receiver of the MT 306. These codes must appear in alphabetical order (letters take precedence over numbers) (Error code(s): T96).
Location Code 1 and Bank Code 2 are separated by four digits, which must consist of the rightmost non-zero digit of field 36 in sequence D, when the option style is Vanilla, or the field 37U in sequence G when the option style is different from Vanilla, preceded by the three digits to the left of it. If there are no digits to the left of it, the space must be zero filled (Error code(s): T22).