[Sqlpp-devel] reference in same table

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Hi!
Can I implement a reference from a foreign key  to a  primary key field  
in the same table?
I try the something like this:
<table id="users" name="Users" field-prefix="User" qualifier="test_" 
fixed="false" signed="false" suffix="">
            <field id="userid" name="ID" type="int" primary-key="true" />
            <!-- <field id="bossid" name="bossID" type="int" /> -->
            <field id="username" name="Name" type="NVARCHAR(30)" 
nullable="false" />
            <field id="userlastname" name="LastName" type="NVARCHAR(30)" 
nullable="true" />
            <reference id="ref_myBoss" ref-table="users" field-prefix="" 
nullable="false" match="userid" name="bossid" />
            <!-- <reference id="ref_myBoss" ref-table="users" 
field-prefix="" nullable="false" name="bossid"/> -->
</table>
but I get error that a "duplicate field name while creating foreign 
keys" was found.
Could you help me?

What make the match and name attribute in reference-type tag exactly?

Thank you!