I’m wondering if there is any particular reason to not allow to define a view location as a parent of a warehouse location.
I thought this was the right solution to get the stock of multiple warehouses as suggested on the old mailing list
But this was updated to fix Infinite loop on creating production_requests (#4279) · Issues · Tryton / Tryton · GitLab but it seems I missed to add back the view type as warehouse parent. 
I’ve just filled https://bugs.tryton.org/issue10487