BuyInRgltryAdvc
                Mandatory
                AcctOwnr
                Optional
                SfkpgAcct
                Mandatory
                BuyInAttrbts
                Repetition (1..n)
                Ref
                Mandatory
                AcctOwnrTxId
                Optional
                AcctSvcrTxId
                Optional
                Market Infrastructure Transaction Identification
MktInfrstrctrTxId
                Optional
                Definition: Identification of a transaction assigned by a market infrastructure other than a central securities depository, for example, Target2-Securities.
Type: Max35Text (String)
Restrictions:
- MinLength: 1
- MaxLength: 35
PrcrTxId
                Optional
                PoolId
                Optional
                CmonId
                Optional
                TradId
                Optional
                BuyInStat
                Mandatory
                BuyInDfrrl
                Mandatory
                FinInstrmId
                Optional
                Qty
                Optional
                BuyInPric
                Optional
                CshCompstnAmt
                Optional
                BuyInSttlmDt
                Optional
                SplmtryData
                Repetition (0..n)