BuyInRgltryAdvc
                Mandatory
                AcctOwnr
                Optional
                SfkpgAcct
                Mandatory
                Mandatory
                Tp
                Optional
                Mandatory
                Issuer
Issr
                Mandatory
                Definition: Entity that assigns the identification.
Type: Max35Text (String)
Restrictions:
- MinLength: 1
- MaxLength: 35
SchmeNm
                Optional
                Nm
                Optional
                BuyInAttrbts
                Repetition (1..n)
                SplmtryData
                Repetition (0..n)