Specific date of trade settlement (SettlementDate) in YYYYMMDD format. If present, this field overrides SettlType (63). This field is required if the value of SettlType (63) is 6 (Future) or 8 (Sellers Option). This field must be omitted if the value of SettlType (63) is 7 (When and If Issued) (expressed in local time at place of settlement).

public DateTimeOffset SettlDate { get; set; }