Thank you Ashish.
In my case there are 3 validations which I am doing based on the Select * query.
Now, where will I insert my At Selection-screen on field?
Supposing I do At selection-screen on field 3 times on all my 3 fields, where should i place it in my code so that it works? (sorry i tried a few times already and did not work for me)
Can you help out please?
Thanks.