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is it possible to check a sublist field value before edit and after edit when the user leaves the field?

suitescript only offers a validateField entry point to validate if a field cn change its value and a fieldChanged entry point for after its value has changed

nothing for before editing, you would have to use normal javascript for that and read the DOM

you might find it easier to keep track of the fields value when the page loads in the pageInit entry point and use the tracked valued to compare to the current value