Symptoms

The issue may appear on Fat Verification Station on the attempt of taking a task. The following error message will occur:

Violation of PRIMARY KEY constraint 'PK_<...>' Cannot insert duplicate key 
in object 'dbo@ProcessingStage'. The duplicate key value is (x). 
in method { call Task_LockExistingTask(?, ?, ?, ?, ?, ?, ?, ?)}

Cause

The issue occurs if the task was assigned to the group of verification operators. This particular bug was fixed in the FlexiCapture 12 Release 2 build 12.0.2.1420. 

Resolution

In order to bypass this issue please try to use a different scenario of task assignment.

If a workaround is not an option, we recommend updating to the latest version of the software.