https://bugzilla.wikimedia.org/show_bug.cgi?id=55005
--- Comment #2 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- Something like
pwb.py claimit -ref:"Property:P1234" P123 Q1234567 -namespace:0
throws an error:
pywikibot.data.api.APIError: param-missing: Either provide the item "ids" or pairs of "sites" and "titles" for corresponding pages.
Maybe it was fixed in last weeks update.