Last modified: 2013-08-22 14:07:41 UTC
When using action=wbeditentity with param 'site' and 'title' it will give the following error message: code=no-such-entity, info=Either 'id' or 'new' parameter has to be set I have seen this as alternative to id, when editing a existing item.
Just a note: this may already be fixed ready for next weeks deployment and I will check on Monday.
https://gerrit.wikimedia.org/r/#/c/78665/