Issue Description

An error occurs when executing the Add method for a REST Endpoint Service to add a serialized value to the Smartobject.

Error Message

The following errors occur: “code 400 exception” or “code 500 exception”


  1. Ensure you have K2 Five (5.1) installed.
  2. Get the K2 Five (5.1) FP5 from Regional Support.
  3. Install the K2 Five (5.1) FP5 to apply the fix.


After applying the FixPack the REST service instance must be refreshed and the SmartObjects must be regenerated.