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When trying the following

{
 'action': 'wbsetlabel', 
 'id': 'Q3083',
 'language': 'no', 
 'value': '', 
 ...
}

I get the following response:

{'servedby': 'mw1198', 'error': {'info': 'Another item (3093) already has label "Ēna" and description "Francijas departaments" associated with language code lv.', 'code': 'failed-save', 'messages': {'0': {'type': 'error', 'name': 'wikibase-error-label-not-unique-item', 'parameters': ['Ēna', 'lv', 3093, 'Francijas departaments']}, 'html': {'*': '<p>Another item (3093) already has label "Ēna" and description "Francijas departaments" associated with language code lv.\n</p>'}}}

I have no idea how the reported constraint violation ('Another item (3093) already has label "Ēna" and description "Francijas departaments" associated with language code lv.') got there in the first place, but it doesn't seem right that it should stop my edit which is not touching the 'lv' language.

Another example from Q703932: 'Another item (216614) already has label "Alan Smith" and description "piłkarz angielski" associated with language code pl.'