I have detail page on which I have created two fields - PageNumber__c and Book__c.

I have a requirement that if the pageNumber__C is populated with a value then the Book__c field should not be edited. How can I do this?

What I think - Can I make a validation rule, which would check if pageNumber__c is not null then if book__c isChanged() then throw an error. Is this approach possible. Any ideas?

  • 1
    Yes, Validation rule is the right approach here. Apr 20, 2017 at 2:31
  • Thanks. Can you give me the syntax on how the formula would look like?
    – SfdcBat
    Apr 20, 2017 at 2:36

1 Answer 1


you can do a validation rule with a formula something like this..


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .