Issue Description

When executing the Add method for a Rest Endpoint Service to add a serialized value to the Smartobject, an error occurs.

Error Message

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


  1. Ensure you have K2 Five RTM installed.
  2. Get the K2 Five RTM FP28 from Regional Support.
  3. Install the K2 Five RTM FP28 to apply the fix.


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