Multiple flag gets lost when updating a hierarchy
A problem reported by Aleks from the SHAHI project turned out to be created by a bug where, when updating a hierarchy, the multiple flag can get lost.
This can be problematic because later updated entities with multiple links to this (now single instead multiple) type can loose all links except one.
The bug was introduced with 7.0.0 to New Year, is fixed with 7.0.2 and hopefully doesn't affect other projects. But I will check existing projects just to be safe.