Hi I have a requirement. I have a custom Checkbox field inside case object say "res__c". When a Email is received then this res__c should be TRUE. And later if the case record is edited, then res__c should be false. So, i have written a after insert trigger on EmailMessage. Here i have mapped EmailMessage.ParentID and Boolean value.. Once an email is received, that is,

for(EmailMessage Email : Trigger.New) {
IF(Email.Incoming == TRUE)
 res__c = true;
// added email.parentID and res__c to the map

Since the trigger is running on EmailMessage object, i cannot write a before update trigger on Case object. So i wrote a Workflow.. IN this workflow, action is ISCHANGED(LastModifiedDate)and field update that res__c = false. Now, what am facing is that when a new email arrives, both Trigger and Workflow performs at the same time and the final value on the res__c is becoming false. I checked the trigger and it gives 100% code coverage and Update happens on the res__c when a mail is received and it returns true. But at the same ISCHANGED() function is also running on the INSERT of record itself. I think that ISCHANGED() function runs on insert because the Lastmodified Date value for a record is null and its being changed to a value of NOW() on the creation of record.

So please provide me an idea of how to resolve this,

  • should i try something like Datetimevalue(LastmodifiedDate)-Datetimevalue(CreatedDate)<>0 for workflow action (or)
  • Should i write a trigger on case object to uncheck the res__c value on any update for the record (or)
  • will i be able to check for change in case record value on the after insert trigger of Emailmessage itself.

1 Answer 1


Have you tried using the IsNew() function in your workflow criteria? Try this, I've added a check to ensure that CreatedDate and LastModifiedDate are different, and a check for the IsNew flag.

And (
    CreatedDate <> LastModifiedDate,
    Res__c = true

You could also update your Email trigger so that it only update Case records when Res__c is equal to false. It won't solve your problem but there's no need to update Case records when the Res__c field is already set to true.

You could write a Case trigger to gain a finer level of control over what's happening, but I'd do that as a last resort.

Edit: there's no reason we can't check for a true value in the formula too.

Edit 2:

Ok since you're having trouble with this approach, let's try something different.

  1. Res__c - change this to a Formula(Boolean) field.
  2. LastEmailDate__c - this will be a DateTime field.

Now, in your trigger simply update Case.LastEmailDate__c whenever a new Email is received for that Case.

For Res__c, have a formula something like:

If (
    LastEmailDate__c < LastModifiedDate,

So assuming that Case.LastEmailDate__c is always being correctly populated by your trigger, Case.Res__c will always be false if the Case has a LastModifiedDate greater than the LastEmailDate__c i.e. if the record has been edited after the last Email was received.

If you want you can change the return type of Res__c to make it show text value, RAG images etc.

An added bonus is that no workflow is required!

  • I tried to change the workflow action as you have suggested, but still the trigger value is overwritten. Res__c is set to true by trigger but on insert res__c is set to false by workflow action. workflow makes res__c to false on insert itself.
    – AjaySFDC
    Aug 27, 2014 at 7:04
  • I've added a slightly different approach which I think will work. Aug 27, 2014 at 8:24
  • Thanks a lot .. I have manipulated the formula a bit to make it work, IF(LASTEMAILDATE__C == LASTMODIFIEDDATE), True, False. This worked fine. But, am curious to know whether instead of a trigger on emailmessage can we go for a workflow on emailmessage. Will workflow change the value of a formula field?
    – AjaySFDC
    Aug 27, 2014 at 13:56
  • I had a quick look when coming up with that alternative solution and it doesn't look like you can create a workflow on EmailMessage - but yes that would be a great solution. Aug 27, 2014 at 13:59

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