Is the procedure to set the root concept in Apelon DTS 4 the same as this wiki shows?

https://sourceforge.net/apps/trac/apelon-dts/wiki/FAQ

Thanks in advance

No. The Root process has been significantly simplified in V4. First, drag the desired Thesaurus Namespace into the Detail panel. Right click on the name of a version in the "Versions" tree and select "Add Root" from the popup (roots are Version-specific). Note that the default DTS hierarchy "Parent Of" association must have already been created in the Namespace.

The Add Root dialog will open. Drag a desired root concept into the drop field, then click "Add Concept as Root". That should do it.

Additional roots can be added by right clicking on either the version name or the "Roots" node and roots can be deleted by right clicking on their entry below the "Roots" node.

Thank you! But when I have tried to add the root concept an error has been showed by the DTS Editor "Default axis AssociationType 'Parent Of' does not exist". ¿Is this AssociationType obligatory?

Yes. The "Parent Of" association type must exist in the Namespace.