SOA should be FQDN

The form that adds new DNS Zone ask for SOA which should be called FQDN ( fully qualified domain name ).

That's because The SOA <origin> value suppose to be the domain of the server that hold the master zone.
And not the new domain name.

from RFC 1033

Code:

SOA  (Start Of Authority)

           <name>  [<ttl>]  [<class>]  SOA  <origin>  <person>  (
                           <serial>
                           <refresh>
                           <retry>
                           <expire>
                           <minimum> )

   The Start Of Authority record designates the start of a zone.  The
   zone ends at the next SOA record.

   <name> is the name of the zone.

   <origin> is the name of the host on which the master zone file
   resides.

   <person> is a mailbox for the person responsible for the zone.  It is
   formatted like a mailing address but the at-sign that normally
   separates the user from the host name is replaced with a dot.