What is the difference between Field Edit and Field Change events?
Field Change PeopleCode is for recalculating field values based on changes made to other fields. For instance, suppose you have 2 fields, rate and quantity and there is another field which shows total cost. Whenever a value is changed in either of the two fields, rate and quantity, the total cost will also change. So on the field change event of those two fields, you can write code to calculate the total cost.
Field edit event is used for validating field values. If the field doesn’t pass the validation, an error message is shown and the page is redisplayed with that field marked in red. For instance, if you do not want a certain quantity to exceed 1,000 and it does, the system should display an error. You can write PeopleCode that will check the quantity, if it is greater than 1000 an error message will be displayed.
*Questions excerpted from ITToolBox.com*
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