Issue Description

When you use an item reference based on a SharePoint list lookup column in a workflow, 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.

Resolution

  1. Ensure you have K2 Five (5.0) installed.
  2. Download and Install the K2 Five (5.0) September 2018 Cumulative Update from K2 Partner and Customer Portal.
  3. Download the K2 Five (5.0) September 2018 Cumulative Update FP05 from K2 Partner and Customer Portal.
  4. Install the K2 Five (5.0) September 2018 Cumulative Update FP05 to apply the fix.
  5. Refresh the REST service instance.