Mandatory in mandatory sequence A
This field identifies party A.
Identifier Code must be a registered BIC (Error code(s): T27,T28,T29,T45).
For matching purposes, option A must be used when available.
Party A is either the sender :94A:BILA, or, the institution or corporate on whose behalf the message is sent :94A:AGNT, except when the Sender is a money broker :94A:BROK.
See the chapter Usage Rules for this MT.