when create criteria with associations, i get this error:
ORA-00918: column ambiguously defined

mapping:
<class name="User" table="FRAME_USER" dynamic-update="true" dynamic-insert="true">

<id name="id" type="long" unsaved-value="null">
<column name="ID" not-null="true"/>
<generator class="sequence">
<param name="sequence">frame_user_seq</param>
</generator>
</id>

<version type="timestamp" column="stamp" name="timestamp" unsaved-value="null"/>

<property name="user_name" type="string" not-null="true"/>
<property name="blocked" type="yes_no" not-null="true"/>
<property name="access_logon" type="timestamp"/>
<property name="denied_logon" type="timestamp"/>
<property name="inactivity_time" type="long"/>
<property name="session_count" type="long"/>

<idbag name="terminalGroups" table="FRAME_USER_TERMINAL" fetch="join" outer-join="true">
<collection-id column="ID" type="long">
<generator class="sequence">
<param name="sequence">frame_user_terminal_seq</param>
</generator>
</collection-id>
<key column="id_user"/>
<many-to-many column="id_terminal_groups" class="TerminalGroup" fetch="join" outer-join="true"/>
</idbag>
</class>
<class name="TerminalGroup" table="FRAME_TERMINAL_GROUPS" dynamic-update="true" dynamic-insert="true">

<id name="id" type="long" unsaved-value="null">
<column name="ID" not-null="true"/>
<generator class="sequence">
<param name="sequence">frame_terminal_groups_seq</param>
</generator>
</id>

<version type="timestamp" column="stamp" name="timestamp" unsaved-value="null"/>

<property name="name" column="group_name" type="string" not-null="true"/>

<idbag name="terminals" table="FRAME_TERMINAL_REL" fetch="join" outer-join="true">
<collection-id column="ID" type="long" >
<generator class="sequence">
<param name="sequence">frame_terminal_rel_seq</param>
</generator>
</collection-id>
<key column="id_term_group"/>
<many-to-many column="id_term" class="Terminal" fetch="join" outer-join="true"/>
</idbag>
</class>
<class name="Terminal" table="FRAME_TERMINAL" where="status != 'D'" dynamic-update="true" dynamic-insert="true">

<id name="id" type="long" unsaved-value="null">
<column name="ID" not-null="true"/>
<generator class="sequence">
<param name="sequence">frame_terminal_seq</param>
</generator>
</id>

<version type="timestamp" column="stamp" name="timestamp" unsaved-value="null"/>
<property name="status" type="char" not-null="true"/>

<property name="mac" type="string" not-null="true"/>
<property name="name" column="ident" type="string" not-null="true"/>
<property name="description" type="string"/>
code:
session.createCriteria(User.class)
.add(Restrictions.like("user_name", "%")
.createCriteria("terminalGroups")
.add( Restrictions.like("group_name", "%").
.setProjection(Projections.rowCount())
.uniqueResult();