Open/Close reporting is enabled for arming All-On but not for arming Part-On.
Open/Close Reports for Part On Modes is controlled in Area Wide Parameters. The panel will send Open or Close reports for All-On arming with default settings however Part On O/C reporting is disabled by default.
Go to the desired area in Area Parameters and select Open/Close Reports for Part On= Yes.
Set the required nibble as described in figure 1:
Default: 1 (for all areas)
To turn on area open/close, and the part mode open/close only, set the above nibble to: 5