The workflow could not update the item, possibly because one or more columns for the item require a different type of information.
Recently I had an issue with SharePoint Designer 2010 workflow. While it was operational on some list item, running on another item caused an workflow cancelling and an error in the history list saying that "The workflow could not update the item, possibly because one or more columns for the item require a different type of information". The error occured even if the first activity was Log to history list "Hello world" message. Searching the internet resulted no relevant solution.
With trial and error I determined that Stop workflow activity can be used without an error if it is placed before the problematic activity. Using that approach I found out that the problem was in Set workflow variable activity. I was trying to set string variable to calculated field value of an item from another list. According to item retrieval conditions no item returned for specified values and that caused such a wierd error message.
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