Solaris 10, useradd command

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http://unix.stackexchange.com – When I used useradd command to add a new user for my Solaris 10 System, I specify /home/user-name to be its home directory. but the command didn't run successfully, and when I put the /export/home/user-name as its home directory it runs successfully. The first command is: useradd -md "/home/munix" -s "/bin/ksh" munix --> give me an error, which is the home directory can not be created, but the user is added to passwd file the second command is: useradd -md "/export/home/munix munix" munix --> home directory created successfully why???? (HowTos)