Description
Type: int
Describes the source of the identifier that RelatedTradeID <1856> represents.
Valid values:
- 0 = Non-FIX source
 - 1 = Trade ID
 - 2 = Secondary trade ID
 - 3 = Trade report ID
 - 4 = Firm trade ID
 - 5 = Secondary firm Trade ID
 - 6 = Regulatory trade ID