Last modified: 2013-08-25 17:05:45 UTC
There is possibility to add exactly the same claim (https://www.wikidata.org/w/index.php?title=Q850989&diff=58140967&oldid=57726821). I guess it shouldn't be possible.
And it's also possible using API (https://www.wikidata.org/w/index.php?title=Q850989&diff=58152045&oldid=58141083).
*** This bug has been marked as a duplicate of bug 46293 ***