I'm trying to create a formula field on the Case object. I would like to store the email addresses in the original email that caused the creation of the Case (Email-to-Case).
When I use the Insert field button in the formula editor, I can navigate to the field I want to use, which is Source.ToAddresses.
However, when I validate the formula, it gives this error:
Error: Specify an object type for the Source field.
I can't find anything on Google that references this error message. Has anyone seen this before or know how I can use that Source.ToAddress in my formula field?
Update: It appears that Source is the name of a lookup field on the Case object to the EmailMessage object. I was originally thinking "Source" was some kind of special cross object special function.
So it looks like my question is specifically related to the Case object and the Source.ToAddress field. I'm still stumped by what the error message means by specify an object type for the source field.