$(this.promiser) doesn't expand properly

Regarding the reference manual, it said "Current promise types that define $(this.promiser) are: files, processes, commands." so I tried to create promises to use that variable. It turned out that it didn't work as expected.

Here is my test policy.
<pre>
body common control
{
bundlesequence =>

{ "test" }

;
inputs =>

{ "/var/cfengine/inputs/libraries/cfengine_stdlib.cf" }

;
host_licenses_paid => "25";
}

bundle agent test
{
files:
any::
"/var/cfengine/masterfiles/promises.cf"
copy_from => local_cp("/tmp$(this.promiser)");

processes:
any::
"cf-monitord" restart_class => canonify("restart_$(this.promiser)");

commands:
any::
"/bin/echo"
args => "Nakarin $(this.promiser)";

"/bin/echo"
args => "--> Restart a service", ifvarclass => "restart_cf_monitord";
}
</pre>

<pre>

1. /var/cfengine/bin/cf-promises -V

@@@
@@@ cf-promises

@ @@@ @ CFEngine Core 3.4.0b3.4b24c8aac3612ae4ecf0dc2b2b540d3f3bccbeae
@ @@@ @ CFEngine Nova 3.0.0a1.366236c3e429c549d3e3245621ff7299b1558f8d
@ @@@ @
@ @
@@@
@ @
@ @
@ @

Copyright (C) CFEngine AS 2008-2012
See Licensing at http://cfengine.com/3rdpartylicenses
</pre>

Out put on screen.
<pre>

1. /var/cfengine/bin/cf-agent -f /tmp/xxx.cf -IK
   !! No commercial license file found - falling back on internal expiry
   Can't stat /tmp$(this.promiser) in files.copyfrom promise
   -> Executing '/bin/echo Nakarin $(this.promiser)' ... (no timeout)
   Q: ".../bin/echo Nakar": Nakarin $(this.promiser)
   I: Last 1 quoted lines were generated by promiser "/bin/echo Nakarin $(this.promiser)"
   -> Completed execution of /bin/echo Nakarin $(this.promiser)
   </pre>

Nothing worked for me.