user interface

Hi,

I am loading an interface  when a one of the sub action button was clicked and this interface will have 2 dropdowns along with "Submit" and "Cancel" buttons.

I need to validate when user click on "Submit" and should not allow the form to submit when if some of the rule inputs CDT data is missing.

How can I stop submitting the form when user clicks on "Submit" button and also, I have to show the error message by saying "you have missed some of the data fields before performing any option selection".

How can I achieve this. I am missing some kind of trick here.

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