While importing a mapping (caUtils load-import-mapping) and defining groups on that mapping, I get this error :
Skipped items for ca_objects.elem_c.subelem1 because no common grouping could be found
After some searching, I found that the issue come from an existent value for "CA table.element".
I open and close this bug for the record, to allow anyone in the same case with me avoid loosing too much time for untested user input.
I already opened a ticket for checking "CA table.element" values: #PROV-1969