Why is this element a subelement of another when it is not a subarea of it:
Saint-Nazaire (18349)
Céret (2767883)

https://www.openstreetmap.org/relation/18349#map=13/42.6491/3.0632
https://www.openstreetmap.org/relation/2767883#map=13/42.6491/3.0632

Additionally, Saint-Nazaire doesn't count on the list of communes of Céret:
https://fr.wikipedia.org/wiki/fr:Arrondissement%20de%20C%C3%A9ret?uselang=en