Type: String
For bid lists, unique identifier for BidResponse(35=I) as assigned by sell-side (broker, exchange, ECN). Uniqueness must be guaranteed within a single trading day.
For quotes, unique identifier for the bid side of the quote assigned by the quote issuer.
Added in protocol FIX.4.2
See in: FIX.4.2, FIX.4.3, FIX.4.4, FIX.5.0, FIX.5.0SP1, FIX.5.0SP2.