Using %{User-Password} in sql query for mschapv2

Hi everybody, I use FreeRADIUS Version 2.1.10 on Debian with OpenVPN and xl2tp/openswan and the rlm_sql module. I want to use the user password in a sql query in dialup.conf. This works fine with ssh and openvpn logins but not with mschapv2. I don't know if the password is really not submitted or just not replaced in the sql query. Is there a simple way to make this work? Thanks in advance