Inconsistent admin_level on relation and label_node

[Noki]

Hi!

We're currently play around with openstreetmap data and found quite some inconsistencies between administrative areas and the corresponding label nodes. The inconsistencies make it really hard to automatically build a trustworthy hierachie.

We found 53 relations where the admin_level of the relation and the area differs.

In my opinion areas and corresponding label nodes should always have the same admin_level and whenever there are multiple administrative levels there should be a relation for each one of them, even if they cover exactly the same area (correct my when I'm wrong).

From what I can see most of the time the correct admin_level is at the area.

I tried to write a challenge for it but I could not get the data selection working with the Overpass API.

Here is what I was trying to do:

RELATION MUST HAVE boundary=administrative AND admin_level IN (2 ...11) AND has(lable_node)
CHECK: relation->admin_level <> label_node->admin_level

Maybe someone could help with this one. Here is a list of affected relations: https://docs.google.com/spreadsheets/d/1yu1-3F8VYF8hA4ZuE_P_bIyuFpz_XZAbWRjlrDd8sdU/edit#gid=0

Best Regards
Tobias