Where is the .ID coming from in FOLLOW_UP_USER_C.ID? Please post the entire XAML or send it to our support staff for review.
Sorry. I dont know how the .ID got in there. Here is the error again.
error 1549: Activity 'Calls1_AssignedUserID' validation failed: Path 'FOLLOW_UP_USER_c' used to specify member for 'Quotes1' is invalid. Path needs to point to valid member.
We are still going to need to see the XAML.
Also, can you confirm that FOLLOW_UP_USER_C is a Guid and not just a text field.