BuyInRgltryAdvc
                Mandatory
                AcctOwnr
                Optional
                SfkpgAcct
                Mandatory
                BuyInAttrbts
                Repetition (1..n)
                Ref
                Mandatory
                BuyInStat
                Mandatory
                BuyInDfrrl
                Mandatory
                FinInstrmId
                Optional
                Qty
                Optional
                BuyInPric
                Optional
                CshCompstnAmt
                Optional
                Buy In Settlement Date
BuyInSttlmDt
                Optional
                Definition: Settlement date of the buy-in.
Type: DateAndDateTime2Choice
Dt
                Choice
                DtTm
                Choice
                SplmtryData
                Repetition (0..n)