Wikimedia Bugzilla is closed!

subster.py was able to set references to wikidata claims/entries, but this does not work anymore, instead it raises an exception:

 Traceback (most recent call last):
   File "subster.py", line 609, in data_save
     comment=summary)
   File "/data/toolserver/pywikipedia-git/wikipedia.py", line 4826, in editclaim
     raise RuntimeError("API query error: %s" % data)
 RuntimeError: API query error: {u'servedby': u'mw1191', u'error': {u'info': u'Malformed input: +00000002013-11-23T12:50:53Z', u'code': u'invalid-snak-value', u'messages': {u'0': {u'type': u'error', u'name': u'wikibase-validator-malformed-value', u'parameters': [u'+00000002013-11-23T12:50:53Z']}, u'html': {u'*': u'<p>Malformed input: +00000002013-11-23T12:50:53Z\n</p>'}}}}

Since subster.py has not changed during this time, this has to be caused either by changes in wikipedia.py or (IMHO more probable) in wikidata mw software.