If the message sender is an FI, this data element will contain the sender’s Global Intermediary
Identifying Number (GIIN). If the message is sent by an agent or other service provider that
is not acting as a Sponsoring Entity, then the sending company IN is the GIIN of the FI that
maintains the reported financial account or that makes the reported payment (reporting FI), not
the GIIN of the agent or other service provider. Entry of the GIIN is mandatory if sent from
an FI; the report will not be accepted if an FI fails to include its GIIN. The GIIN is a 19-digit
alphanumeric identifier and should be entered with appropriate punctuation (period or decimal).