@Kamal and
@Pete_L Unfortunately that's not how it functions.
The key field in Work Queue can definitely contain duplicate values.
There is no internal check within Blueprism to avoid Duplicate Queue Items.
It can be achieved via 2 methods:
1. The collection being inserted in the ADD TO QUEUE action should contain unique values (Use Remove Duplicates from Collection VBO to obtain unique rows in collection)
2. Before inserting a record in Queue, use action "Is Item in Queue" from Work Queue VBO. It lets you compare the key on new item with all the existing items in the queue. Based on the output (True/False), decide whether to insert the record or not.