BuyInRgltryAdvc
                Mandatory
                AcctOwnr
                Optional
                SfkpgAcct
                Mandatory
                BuyInAttrbts
                Repetition (1..n)
                Ref
                Mandatory
                AcctOwnrTxId
                Optional
                AcctSvcrTxId
                Optional
                MktInfrstrctrTxId
                Optional
                PrcrTxId
                Optional
                PoolId
                Optional
                Common Identification
CmonId
                Optional
                Definition: Unique reference agreed upon by the two trade counterparties to identify the trade.
Type: Max35Text (String)
Restrictions:
- MinLength: 1
- MaxLength: 35
TradId
                Optional
                BuyInStat
                Mandatory
                BuyInDfrrl
                Mandatory
                FinInstrmId
                Optional
                Qty
                Optional
                BuyInPric
                Optional
                CshCompstnAmt
                Optional
                BuyInSttlmDt
                Optional
                SplmtryData
                Repetition (0..n)