Document (ref_doc) field not visible for References

According the the manual, the Document (ref_doc) field can be used for entering the full text of a reference. When I double-click a reference, and click the 'All fields' button to display all available fields, I don't see any field called 'document' (or ref-doc).

Is there something I need to do in order to make this field visible for me to use?

Thanks

The "Ref_doc" field can be

The "Ref_doc" field can be accessed on the "Document" tab of the reference editor window.

I can't find a 'document

I can't find a 'document tab' in the reference editor window. Can you explain further where this is located?

Thanks

It is the "Rich Text" tab on

It is the "Rich Text" tab on the reference editor.