Field
| ID | 8 |
| Abbr Name | BeginString |
| Type | BeginStringCodeSet |
| Pedigree | Added FIX.2.7, Updated EP270 |
Identifies beginning of new message and session protocol version by means of a session profile identifier (see FIX Session Layer for details). ALWAYS FIRST FIELD IN MESSAGE. (Always unencrypted).
Used in components: