SctiesSttlmCondModStsAdvc
                Mandatory
                ReqRef
                Mandatory
                AcctOwnr
                Optional
                Safekeeping Account
SfkpgAcct
                Optional
                Definition: Account to or from which a securities entry is made.
Type: SecuritiesAccount30
Mandatory
                Tp
                Optional
                Nm
                Optional
                BlckChainAdrOrWllt
                Optional
                ReqDtls
                Optional
                PrcgSts
                Mandatory
                SplmtryData
                Repetition (0..n)