there are some issues that need attention:
*we should use nat_ref for the official numbering and use ref only where there are actual signs
*motorway numbers should also apply in non-motorway sections of these roads (as clearly stated in the document)
The other document I mentioned demonstrates that the network appears to be show the complete list as a “wish-list” for how the network should look if it ever is completed (see https://diavgeia.gov.gr/doc/ΩΡ6Γ4653ΟΞ-ΖΒΑ , see map on back). Until then we have to use the terrible old 1998 EO system for the non-upgraded sections.