SctiesSttlmCondModStsAdvc
                Mandatory
                Request Reference
ReqRef
                Mandatory
                Definition: Identification of the SecuritiesSettlementConditionsModificationRequest.
Type: RestrictedFINXMax16Text (String)
Restrictions:
- Pattern: ([0-9a-zA-Z\-\?:\(\)\.,'\+ ]([0-9a-zA-Z\-\?:\(\)\.,'\+ ]*(/[0-9a-zA-Z\-\?:\(\)\.,'\+ ])?)*)
- MinLength: 1
- MaxLength: 16
AcctOwnr
                Optional
                SfkpgAcct
                Optional
                BlckChainAdrOrWllt
                Optional
                ReqDtls
                Optional
                PrcgSts
                Mandatory
                SplmtryData
                Repetition (0..n)