That field was originally IsWaitingForSyncApproval, but when it was dragged on the screen, the caption was changed. In the back-end we are looking for IsWaitingForSyncApproval, and we do all the work automatically (i.e. no need for special actions for you for this field).
You can see that the field is tied to IsWaitingForSyncApproval by editing the checkbox. You'll see the caption is "Checkbox Properties for field IsWaitingForSyncApproval" which tells you the real field name. Yes......a little obscure, but at least it's there!!
Paul