PtyRegnAndGrntNtfctn
                Mandatory
                Hdr
                Mandatory
                ApplCntxt
                Optional
                LttrIdr
                Mandatory
                Dt
                Mandatory
                RltdLttr
                Repetition (0..n)
                RltdMsg
                Repetition (0..n)
                CnttIdr
                Repetition (0..n)
                Instruction Priority
InstrPrty
                Optional
                Definition: Urgency or order of importance that the originator would like the recipient of the business letter to apply to the processing of the letter.
Type: Priority3Code (String)
Allowed Values:
- URGT (Urgent): Priority level is urgent (highest priority possible)
- HIGH (High): Priority level is high.
- NORM (Normal): Priority level is normal.
Orgtr
                Mandatory
                PmryRcpt
                Repetition (1..n)
                Sndr
                Repetition (0..n)
                AuthstnUsr
                Repetition (1..n)
                RspnRcpt
                Repetition (0..n)
                CpyRcpt
                Repetition (0..n)
                OthrPty
                Repetition (0..n)
                AssoctdDoc
                Repetition (0..n)
                GovngCtrct
                Repetition (0..n)
                LglCntxt
                Repetition (0..n)
                AddtlInf
                Optional
                Ntce
                Optional
                VldtnStsInf
                Optional
                DgtlSgntr
                Repetition (0..n)
                NtfctnList
                Repetition (1..n)
                NtfctnCnt
                Optional
                ItmCnt
                Optional
                CtrlSum
                Optional
                AttchdMsg
                Repetition (0..n)