cubicweb #3146358 XY in registry [open]

XY should be defined in a registry in order to allow clean modifications in some cubes. For now, there is only on instance of XY which is modified, thus creating some conflicts. See https://www.cubicweb.org/ticket/3146359

prioritynormal
typebug
done in<not specified>
load1.000
load left1.000
closed by<not specified>