AcctMndtMntncAmdmntReq
                Mandatory
                Refs
                Mandatory
                Fr
                Optional
                CtrctDts
                Optional
                UndrlygMstrAgrmt
                Optional
                AcctId
                Repetition (1..n)
                AcctSvcrId
                Mandatory
                Mandatory
                AnyBIC
                Optional
                LEI
                Optional
                Othr
                Repetition (0..n)
                Mandatory
                SchmeNm
                Optional
                Cd
                Choice
                Proprietary
Prtry
                Choice
                Definition: Name of the identification scheme, in a free text form.
Type: Max35Text (String)
Restrictions:
- MinLength: 1
 - MaxLength: 35
 
Issr
                Optional
                Mndt
                Repetition (0..n)
                Grp
                Repetition (0..n)
                DgtlSgntr
                Repetition (0..n)
                SplmtryData
                Repetition (0..n)