It seems like the option to set checkboxes to "required" is not available in my LiveCycle form. The Object/Value tab only gives me the "User Entered" option (in addition to "Calculated", "Protected", etc.).
Thanks for the reply. What I realized later is that I need the form to check if one of two check boxes is marked prior to clicking a Submit button in one section that comes later. So I don't want the form to make the check boxes required because the first user does not need to check them. So I put this in the script for the Submit button:
if (CheckBox1.rawValue == 0 && CheckBox1.rawValue == 0)
xfa.host.messageBox("Please select Approved or Not Approved before clicking Submit!");