it works changing

<prop oor:name="Work" oor:type="xs:string">
          <info>
            <desc>Specifies the path of the work folder, which can be modified according to the user's needs. The path specified here can be seen in the Open or Save dialog.</desc>
          </info>
          <value>$(work)</value>
        </prop>
to

<prop oor:name="Work" oor:type="xs:string">
          <info>
            <desc>Specifies the path of the work folder, which can be modified according to the user's needs. The path specified here can be seen in the Open or Save dialog.</desc>
          </info>
          <value>file:///opt/documents</value>
        </prop>

in /opt/openoffice.org/basis3.1/share/registry/schema/org/openoffice/Office/Common.xcs

just if someone else is interested

thank you all