GroupWise Mobility Server (GMS) 18.4.1
In the GroupWise client, there is the Main calendar and then sub-calendars, in this example, Personal:
When the user accepts an appointment into the Personal sub-calendar in the GroupWise client, GMS will not properly sync that appointment into the same sub-calendar.
If the user accepts the appointment into the Main calendar, and then moves the appointment into the sub-calendar, GMS will correctly sync that appointment into the sub-calendar.
This has been reported to development as defect # 532079.