202 Secondary Mortgage Market Loan Delivery (004020)
This is the standard X12 004020 spec, with 13 loops and 72 segment positions, as OpenEDI JSON, an ediFabric C# template and an ediFabric Native model. To change it for a trading partner, customize it in the EDI Spec Builder.
Use the 202 spec in your code
ediFabric .NET
Add the C# template and its common files to your project, or reference the template NuGet package, and read 202 files into TS202 objects. See ediFabric .NET.
ediFabric Native
Map version 004020 to the Native model with set_map, then parse 202 files to JSON from Python, Java, C or C#. See Convert between EDI and JSON.
OpenEDI
Select Customize in Spec Builder to copy the spec under your own name, change it for your partner, and parse files against it in EdiNation, ediFabric Native or ediFabric Cloud. Read about OpenEDI.
Generate 202 classes in Python, Java, Node.js, Go, Rust or C
ediFabric Native returns each 202 as JSON, with the property names of the OpenEDI schema. To work with that JSON as typed objects, generate classes from the OpenEDI file in your language and deserialize the JSON into TS202. Serialize the objects back to JSON to build EDI with ediFabric Native. The classes keep the loops, segments, lengths and code lists, but not the EDI data formats, so validate files with ediFabric Native. Read more in Generate a class from OpenEDI.
Python: datamodel-code-generator. Node.js: openapi-typescript. Java, Go, Rust and C: OpenAPI Generator.
202 structure
Loops and segments of the standard 202, with their usage and maximum repeats.
| ID | Name | Usage | Max use |
|---|---|---|---|
| ST | Transaction Set Header | Optional | 1 |
| BGN | Beginning Segment | Mandatory | 1 |
| TRN | Trace | Optional | 1 |
| DTP | Date or Time or Period | Optional | 1 |
| Loop N1 | Name | Optional | 5 |
| N1 | Name | Mandatory | 1 |
| N2 | Additional Name Information | Optional | 1 |
| N3 | Address Information | Optional | 2 |
| N4 | Geographic Location | Optional | 1 |
| REF | Reference Identification | Optional | 3 |
| PER | Administrative Communications Contact | Optional | 2 |
| Loop N9 | Reference Identification | Mandatory | >1 |
| N9 | Reference Identification | Mandatory | 1 |
| Loop DEX | Delivery Execution Information | Mandatory | >1 |
| DEX | Delivery Execution Information | Mandatory | 1 |
| REF | Reference Identification | Mandatory | 15 |
| CN1 | Contract Information | Optional | 1 |
| PCT | Percent Amounts | Optional | 10 |
| INT | Interest | Optional | 10 |
| AMT | Monetary Amount | Optional | 4 |
| QTY | Quantity | Optional | 5 |
| MPP | Mortgage Pool Program | Optional | 1 |
| DTP | Date or Time or Period | Optional | 10 |
| III | Information | Optional | 15 |
| Loop ASM | Amount and Settlement Method | Optional | >1 |
| ASM | Amount and Settlement Method | Mandatory | 1 |
| N1 | Name | Optional | 1 |
| REF | Reference Identification | Optional | 5 |
| Loop NM1 | Individual or Organizational Name | Mandatory | >1 |
| NM1 | Individual or Organizational Name | Mandatory | 1 |
| Loop LX | Assigned Number | Mandatory | >1 |
| LX | Assigned Number | Mandatory | 1 |
| REF | Reference Identification | Optional | 15 |
| AMT | Monetary Amount | Optional | 20 |
| DTP | Date or Time or Period | Optional | 5 |
| YNQ | Yes/No Question | Optional | 10 |
| QTY | Quantity | Optional | 5 |
| N1 | Name | Optional | 6 |
| III | Information | Optional | 50 |
| LUC | Loan Underwriting | Optional | 1 |
| RLD | Down Payment Data | Optional | 50 |
| INT | Interest | Optional | 6 |
| PPD | Payment Pattern Details | Optional | 1 |
| PWK | Paperwork | Optional | 2 |
| BUY | Loan Buydown | Optional | 1 |
| PEX | Property or Housing Expense | Optional | 10 |
| BEP | Borrower Education Program | Optional | 2 |
| Loop IGI | Insurer or Guarantor Information | Optional | >1 |
| IGI | Insurer or Guarantor Information | Mandatory | 1 |
| REF | Reference Identification | Optional | 1 |
| PCT | Percent Amounts | Optional | 10 |
| Loop NX1 | Property or Entity Identification | Optional | >1 |
| NX1 | Property or Entity Identification | Mandatory | 1 |
| NX2 | Location ID Component | Optional | 15 |
| REA | Real Estate Property Information | Optional | 1 |
| PDS | Property Description/Legal Description | Optional | 2 |
| Loop LN1 | Loan Specific Data | Optional | 5 |
| LN1 | Loan Specific Data | Mandatory | 1 |
| YNQ | Yes/No Question | Optional | 1 |
| DTP | Date or Time or Period | Optional | 5 |
| REF | Reference Identification | Optional | 10 |
| Loop CRC | Conditions Indicator | Optional | >1 |
| CRC | Conditions Indicator | Mandatory | 1 |
| IN1 | Individual Identification | Optional | 1 |
| IN2 | Individual Name Structure Components | Optional | 30 |
| DMG | Demographic Information | Optional | 1 |
| QTY | Quantity | Optional | 10 |
| N1 | Name | Optional | 1 |
| YNQ | Yes/No Question | Optional | 5 |
| AIN | Income | Optional | 10 |
| AMT | Monetary Amount | Optional | 15 |
| Loop SCM | Credit Score Model | Optional | >1 |
| SCM | Credit Score Model | Mandatory | 1 |
| SCS | Credit Score | Optional | 5 |
| Loop PAM | Period Amount | Optional | 4 |
| PAM | Period Amount | Mandatory | 1 |
| YNQ | Yes/No Question | Mandatory | 1 |
| REF | Reference Identification | Mandatory | 1 |
| Loop UWI | Underwriting Information | Optional | 5 |
| UWI | Underwriting Information | Mandatory | 1 |
| III | Information | Optional | 10 |
| REF | Reference Identification | Optional | 1 |
| MSG | Message Text | Optional | >1 |
| CTT | Transaction Totals | Optional | 1 |
| SE | Transaction Set Trailer | Optional | 1 |