1] Access the tour details page using below URL:
https://10.0.2.120/api/app/TourListing/ListTours?requestFrom=wRnQ7Y%2fZWlCOXjmz9IS4jw%3d%3d&userName=%2bsj2KXYNrgm8O4Va%2bHPUTQ%3d%3d&password=T6NiPfpN8kLQSGDeUamNAw%3d%3d&corporationID=9587&entityType=Placement&entityID=3
2] Assign Onboard and Onboard Second tour.
3] Try to assign same tours again by clicking "Assign Tour" button.

Actual Result:
Sometimes nothing happens after clicking on "Assign Tour" button, and sometimes it shows proper validation message. We try to find out exact repro steps for this issue, but it seems this issue get repro randomly.

Cc: Prasad Pise, Saurabh Sablaka, Ramya Tantry