AcctOpngAmdmntReq
                Mandatory
                Refs
                Mandatory
                Message Identification
MsgId
                Mandatory
                Definition: Identifies a message by a unique identifier and the date and time when the message was created by the sender.
Type: MessageIdentification1
Mandatory
                CreDtTm
                Mandatory
                PrcId
                Mandatory
                AttchdDocNm
                Repetition (0..n)
                Fr
                Optional
                CtrctDts
                Optional
                UndrlygMstrAgrmt
                Optional
                Acct
                Mandatory
                AcctSvcrId
                Mandatory
                Org
                Mandatory
                Mndt
                Repetition (0..n)
                Grp
                Repetition (0..n)
                RefAcct
                Optional
                DgtlSgntr
                Repetition (0..n)
                SplmtryData
                Repetition (0..n)