When you use an item reference based on a SharePoint list lookup column in a workflow, the incorrect results return at runtime when the item reference resolves. The value returned is “System.String” instead of the actual value of the lookup column.
- Ensure you have K2 Five (5.1) installed.
- Download the K2 Five (5.1) FP27 from K2 Partner and Customer Portal.
- Install the K2 Five (5.1) FP27 to apply the fix.
- Refresh the REST service instance.