Show value of Service Order Custom Field on Appt, Part 2

@davidpoole21 Do not use PXUnboundDefault attribute for bound fields, instead, use PXDefault attribute.

In your case, if you want a custom bound field in FSAppointment, you would need also to add a logic in ServiceOrderEntry maybe in FieldUpdated_CustPORefNbr to update the custom field (FSAppointmentExt.UsrCustPORefNbr) in all existing appointments associated to this customer when this value is updated from the Service Order screen.

However, depending on the use of this custom field, you wouldn’t need to create it, i.e., if you only need to display this value (FSServiceOrder.CustPORefNbr) in the Appointment screen, you could add it in the header of the App screen taking the value directly from FSServiceOrder.CustPORefNbr. There’s already a region in the header where some fields from Service Order are displayed. (Check Branch Location field)

If you still need this field in FSAppointment, another option for you would be to have an unbound field in Appointment screen and forget about adding logic in Service order screen to update this field. In this case I suggest to define the attributes as follows:
 

Notice this field is defined as unbound (PXString) and PXDefault with PersistingCheck = Nothing + PXDBScalar set and keep the value respectively of this unbound field at all time.