# IDocs representation properties

* Original IDoc type name: Enter the name of the IDoc type used.
* Original IDoc extension (optional): Enter the extension to append to the structure name to form a unique name.
* Original IDoc message type (optional): Enter the IDoc message type to use as the default type when an IDoc instance is written.

### In this section

* [Mandatory field values for IDoc files](https://help.qlik.com/talend/en-US/data-mapper-user-guide/8.0-R2026-09/mandatory-field-values-for-idoc-files)