For this you need to write the oncell edit client script.
Like this
function onCellEdit(sysIDs, table, oldValues, newValue, callback) {
var saveAndClose = true;
if (newValue == 1) {
alert('High Impact cannot be set on a list view.');
saveAndClose = false;
}
callback(saveAndClose);
}
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Regards
Dr. Atul G. - Learn N Grow Together
ServiceNow Techno - Functional Trainer
LinkedIn: https://www.linkedin.com/in/dratulgrover
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