Appointment Limits 

How can I limit parents to one appointment per teacher? 

With the PTA (Parent Teacher Appointments) product parents are limited to one appointment per student teacher/class combination. 

What is PTAN?

The default for each class is one appointment per parent / per teacher. You can change this default to allow for more than one appointment for a specific class. If you go into the Class Editor and click on a teacher, you will see their classes listed. On the far right-hand side of each class is a column labeled PTAN (for Parent Teacher Appointments Number). If you increase this to 2 then any parent of a student in that class can make 2 appointments with that teacher. If you only have some kids in the class you want to allow this for, then probably the best way to do this would be to create a new class and fill this class with your select group of kids. To do this you would click on the correct teacher name in the Class Editor roster and then click on the Add Class button. Then you would add students to this class. For this new class you could set the PTAN to 2. Then any parent with a student in this class could book 2 appointments. 

Could you clarify the following settings: "one appointment per class" and "one appointment per teacher"?

Both these settings place additional limits on appointment bookings.

If you check the box "one appointment per class", then a parent with twins (or siblings) in the same class (same teacher) can only book one appointment.  

If you check the box "one appointment per teacher, then a parent with a student who has the teacher for two classes can only book one appointment. For example, if student A has teacher B for both Math and Science, the parent will only be able to book one appointment with teacher B.