SYMPTOMS
When a packet is sent to API-RPC to get information on Plesk limits,For instance:
<packet version="1.5.0.0">
<domain>
<get-limit-descriptor>
<filter/>
</get-limit-descriptor>
</domain>
</packet>
All limits are shown as writeable by Plesk admin:
<writable-by>admin</writable-by>
but the limits that are shown in Plesk panel as non-supported should not be writeable by anyone:
<writable-by>none</writable-by>