Patch different values for Domain part in FQDN & HostName

We are aware about the fact that FQDN consists of the hostname and domain name as mentioned below :

"A fully-qualified domain name (FQDN) is a complete domain name that specifies the exact location of a computer or a host on the internet. It consists of the hostname and domain name."

As per the Manager Ethernet Interfaces Schema, we have two attributes namely FQDN and HostName.

Suppose if we trigger a PATCH with the below request body,  


{

"FQDN": "usersupport.google.com",


}
we know that HostName will be updated to the value "usersupport" and FQDN will be updated to the value "usersupport.google.com" 


Suppose if we trigger a PATCH with the below request body,

{

"HostName": "adminsupport",

}


we know that HostName will be updated to the value "adminsupport" and FQDN will be updated to the value "adminsupport.google.com"

Consider, we trigger a PATCH with the below request body(i.e. provide different values for Domain part in FQDN(usersupport) and HostName(adminsupport))


{

"FQDN": "usersupport.google.com",

"HostName": "adminsupport"


}

What should be the values of HostName and FQDN be updated to ? Which attribute will have priority over the other ? Does the user needs to pass same values for Domain part in FQDN and HostName ?