Exporting certificate and private key

InFortiGateâ„¢ Certificate Management User Guide Version 4.0 it say:

Connect to the FortiGate unit through the CLI.  Note: As an alternative, you can back up and restore the entire FortiGate configuration  through the System > Maintenance page of the web-based manager. The backup file is  created in a FortiGate-proprietary format. For more information, see the “System  Maintenance” chapter of the FortiGate Administration Guide.  Using certificates to verify identity Backing up and restoring local certificates  FortiGate™ Certificate Management User Guide Version 4.0  01-30005-0182-20071005 17  2 Type the following command:  execute vpn certificate key export <cert_name> <exp_filename>  <tftp_ip> <password>  where:  • <cert_name> is the name of the server certificate; typing ? displays a list of  installed server certificates.  • <exp_filename> is a name for the output file.  • <tftp_ip> is the IP address assigned to the TFTP server host interface.  • <password> is a password that will need to be entered later to import the  PKCS12 file.

Unfortunately; " key" is aloowed syntax on my box (fg200@v4.0.3,build0106,090616) with vdom activated, only accepted syntax is:

 fortigate (global) # execute vpn certificate  ca        ca  crl       crl  local     local  remote    remote  

How to export certicate with private key?