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ability to make a field Read-Only as soon as a value is saved within the field


What would be the easiest way to have a field, that is initially Read-Write to end users UNTIL they enter data into it?

It would be a date field.

We essentially want to lock the field down, from further edits, once data is entered.


Any suggestions are very welcome.


Thank you,



Using a field update, you could switch Record Types after the field is populated and the associated page layout has that field set to read-only.


Or you write an Apex trigger to prevent that field from being changed once its populated - but this won't prevent the data from being entered in the UI.