OTD Message Structures

The X12 OTD Library includes pre-built OTDs for all supported X12 versions. These OTDs can be viewed in the OTD Editor, but cannot be modified.

To customize the OTD structure , for example, to add a segment or loop , you must first generate a .sef file (typically using a third-party application). You then use the SEF OTD Wizard to generate the OTD.