What does this error mean? I keep seeing those errors pop up when validating data for the French Cadastre building imports I’m working on.
I am also getting this error in JOSM version 3376.
The error seems to be originating from MultipolygonTest.java and I can find it in the source but I do not understand enough from “styles” to understand the cause.
Took some time but after reading http://wiki.openstreetmap.org/wiki/Relation:multipolygon better I think I understand the cause.
I did have a building with outer and inner members and had set in the outer “way” the tag “building=yes”, but this is not how it should be, the relation should have “building=yes” while both the inner and outer members should not have it probably.
This did solve the warnings I was seeing.