Hi Eddy - are any of your save rules running concurrently? Sometimes this message means you are trying to save two different records at the same time... are you dealing with multiple SmartObjects or database tables that you save to?

Hi Eddy2,

1) Can you show us a screenshot of the error?

2) Are you executing an Update method?

2a) If you are, are you only entering the Primary Key or Required property? If you are following this process, this is a known issue within K2, and a feature request has been created to handle the situation in a more efficient way. As a workaround, an isnull value must be passed so the error message doesn't show. 

3) If that is not what you are doing:

To debug further, please enable SmartObject logging as per the "Enable SmartObject Server logging" section of the documentation below, replicate the issue, and attach the logs usually located at "C:Program Files(x86)K2 blackpearlServiceBrokerlogs": https://help.k2.com/kb000298

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