Unsuccessful creation of non-persisted OVERFLOW region with custom disk store

When ordering creation of non-persisted OVERFLOW region with custom disk store we get following error message:

gfsh>create disk-store --name=teststore --dir=/diskstore
Member | Status | Message
------ | ------ | ----------------------------
server | OK | Created disk store teststore

Cluster configuration for group 'cluster' is updated.

gfsh>create region --name=testreg --type=REPLICATE_OVERFLOW --eviction-action=overflow-to-disk --eviction-entry-count=1000 --disk-store=teststore
Only regions with persistence or overflow to disk can specify DiskStore. template-region region "null" is not persistent.