I am having an issue with setting up PBA-S POA plans correctly. Is there any way with POA plans configured so it works the same as Plesk Domain hosting:
If they have 1G included and can go up to 100G, it should show 1G as the available resources and anything over 1G as overusage.
The limits ("Included amount", "Upgrade block" and "Overuse rate/Cost for additional resource allocation") may be configured on the "Billable Resources" page of POA subscription.
Refer to PBA-S Provider's Guide for the detail about preferences configuration.