BuyInRgltryAdvc
                Mandatory
                AcctOwnr
                Optional
                SfkpgAcct
                Mandatory
                BuyInAttrbts
                Repetition (1..n)
                Ref
                Mandatory
                BuyInStat
                Mandatory
                BuyInDfrrl
                Mandatory
                FinInstrmId
                Optional
                ISIN
                Optional
                OthrId
                Repetition (0..n)
                Description
Desc
                Optional
                Definition: Textual description of a security instrument.
Type: Max140Text (String)
Restrictions:
- MinLength: 1
- MaxLength: 140
Qty
                Optional
                BuyInPric
                Optional
                CshCompstnAmt
                Optional
                BuyInSttlmDt
                Optional
                SplmtryData
                Repetition (0..n)