AcctOpngAmdmntReq
                Mandatory
                Refs
                Mandatory
                Fr
                Optional
                CtrctDts
                Optional
                UndrlygMstrAgrmt
                Optional
                Acct
                Mandatory
                AcctSvcrId
                Mandatory
                Org
                Mandatory
                Mndt
                Repetition (0..n)
                Grp
                Repetition (0..n)
                Group Identification
GrpId
                Mandatory
                Definition: Specifies the identification of the group.
Type: Max4AlphaNumericText (String)
Restrictions:
- Pattern: [a-zA-Z0-9]{1,4}
 - MinLength: 1
 - MaxLength: 4
 
Pty
                Repetition (1..n)
                RefAcct
                Optional
                DgtlSgntr
                Repetition (0..n)
                SplmtryData
                Repetition (0..n)