Type:string (field name)
Scope:Proc. / Display

Field name which will be updated with the value of the original language record whenever the translation record is updated. This information is later used to compare the current values of the default record with those stored in this field. If they differ, there will be a display in the form of the difference visually. This is a big help for translators so they can quickly grasp the changes that happened to the default language text.

The field type in the database should be a large text field (clob/blob).

This field needs no configuration in $GLOBALS['TCA'][<table>]['columns'], but if you do, select the “passthrough” type. That will enable the undo function to also work on this field.