Data within an MTN99 message is transformed and flattened to a row of data with the following fields in Duco.
| Duco field name | Duco field type | Content / Options |
| Block1_AppID | Text | 1a |
| Block1_ServiceID | Text | 2n |
| Block1_LTAddress_IdCode | Text | 8c |
| Block1_LTAddress_LT | Text | 1c |
| Block1_LTAddress_Branch | Text | 3c |
| Block1_SessionNumber | Text | 4n |
| Block1_SequenceNumber | Text | 6n |
| Block2_InputOutput | Text | 1a |
| Block2_MessageType | Text | 3n |
| Block2_DestinationAddress_IdCode | Text | 8c |
| Block2_DestinationAddress_LT | Text | 1c |
| Block2_DestinationAddress_Branch | Text | 3c |
| Block2_Priority | Text | 1a |
| Block2_DeliveryMonitoring | Text | 1x |
| Block2_ObsolescencePeriod | Text | 3n |
| Block2_InputTime | Text | 4n |
| Block2_MIR | Text | 28c |
| Block2_OutputDate | Date | 6n |
| Block2_OutputTime | Time | 4n |
| Block3_ServiceIdentifier | Text | {103:3!a} |
| Block3_BankingPriority | Text | {113:4!x} |
| Block3_MUR | Text | {108:16!x} |
| Block3_ValidationFlag | Text | {119:8c} |
| Block3_BalanceCheckpoint_Date | Date | {423:YYMMDDHHMMSS[ss]} |
| Block3_BalanceCheckpoint_Time | Time | {423:YYMMDDHHMMSS[ss]} |
| Block3_BalanceCheckpoint_DecimalFractions | Text | {423:YYMMDDHHMMSS[ss]} |
| Block3_MIR_Date | Date | {106:} 6n |
| Block3_MIR_LTIdentifier | Text | {106:} 4a2a2c1c |
| Block3_MIR_BranchCode | Text | {106:} 3c |
| Block3_MIR_SessionNumber | Text | {106:} 4n |
| Block3_MIR_SequenceNumber | Text | {106:} 6n |
| Block3_RelatedReference | Text | {424:16x} |
| Block3_ServiceTypeIdentifier | Text | {111:3!n} |
| Block3_UniqueEndToEndTransactionReference | Text | {121:xxxxxxxx-xxxx-4xxx-yxxxxxxxxxxxxxxx} |
| Block3_AddresseeInformation | Text | {115:32x} |
| Block3_PaymentRelease_ServiceTypeIdentifier | Text | {165:/3!c/34x} |
| Block3_PaymentRelease_UniqueEndToEndTransactionReference | Text | {165:/3!c/34x} |
| Block3_SanctionsSceening_Codeword | Text | {433:/3!a/[20x]} |
| Block3_SanctionsSceening_AddInfo | Text | {433:/3!a/[20x]} |
| Block3_PaymentControls_Codeword | Text | {434:/3!a/[20x] |
| Block3_PaymentControls_AddInfo | Text | {434:/3!a/[20x]} |
| Block4_TransactionReferenceNumber | Text |
Tag: 20 Format Specification: 16x |
| Block4_RelatedReference | Text |
Tag: 21 Format Specification: 16x |
| Block4_Narrative_Line1 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line2 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line3 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line4 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line5 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line6 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line7 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line8 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line9 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line10 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line11 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line12 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line13 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line14 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line15 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line16 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line17 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line18 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line19 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line20 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line21 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line22 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line23 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line24 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line25 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line26 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line27 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line28 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line29 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line30 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line31 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line32 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line33 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line34 | Text |
Tag: 79 Format Specification: 50x |
| Block4_Narrative_Line35 | Text |
Tag: 79 Format Specification: 50x |