Domain same as host name

[dharris at kcp.com]

I have inherited a db file with an entry in it which I do not understand.
In the db.os file there are entries

@    IN   SOA  homer.os.kcp.com. dtheilen.homer.os.kcp.com. (
          3014 ; serial
          3600 ; refresh
          300  ; retry
          3600000   ; expire
          3600 ); minimum
@    IN   NS   homer.os.kcp.com.
@    IN   NS   topten.os.kcp.com.

"a bunch of A records"

os.kcp.com.    IN   MX   10   homer.os.kcp.com.
os.kcp.com.    IN   A    198.62.69.70

It looks like the originator wasn't sure whether to use an MX record or an
A record to make e-mail addressed to somebody at os.kcp.com go to the right
place.

My question is whether this file will "confuse" named in some way or if I
can leave it like this until I can untangle my predecessor's actions.
Thanks for the help.

                    Delmer D. Harris