SctiesSttlmTxModReq
                Mandatory
                ModfdTxDtls
                Mandatory
                UpdTp
                Repetition (1..3)
                Addtn
                Choice
                Deltn
                Choice
                Mod
                Choice
                SttlmTpAndAddtlParams
                Optional
                Lnkgs
                Repetition (0..n)
                TradDtls
                Optional
                FinInstrmId
                Optional
                FinInstrmAttrbts
                Optional
                QtyAndAcctDtls
                Optional
                SttlmParams
                Optional
                StgSttlmInstrDtls
                Optional
                SttlmStgInstrDB
                Mandatory
                CtrPty
                Mandatory
                Vndr
                Optional
                OthrDlvrgSttlmPties
                Optional
                Depository
Dpstry
                Optional
                Definition: First party in the settlement chain. In a plain vanilla settlement, it is the Central Securities
Type: PartyIdentification162
Mandatory
                LEI
                Optional
                AltrnId
                Optional
                PrcgDt
                Optional
                PrcgId
                Optional
                AddtlInf
                Optional
                Pty1
                Optional
                Pty2
                Optional
                Pty3
                Optional
                Pty4
                Optional
                Pty5
                Optional
                OthrRcvgSttlmPties
                Optional
                DlvrgSttlmPties
                Optional
                RcvgSttlmPties
                Optional
                CshPties
                Optional
                SttlmAmt
                Optional
                OthrAmts
                Optional
                OthrBizPties
                Optional
                AddtlPhysOrRegnDtls
                Optional
                SplmtryData
                Repetition (0..n)