Hi Try this SQL it works for me:
SELECT
GroupName.M_ACTOR_C_NAME AS "Group Name",
OBJ_M_ACTOR.M_ACTOR_C_NAME AS "User Name"
FROM
OBJ_M_ACTOR,
OBJ_M_ACTORLINK,
OBJ_M_ACTOR GroupName,
OBJ_M_ACTORLINK GroupLink
WHERE
OBJ_M_ACTOR.M_ACTOR_N_ID = OBJ_M_ACTORLINK.M_ACTL_N_ACTORID
AND OBJ_M_ACTOR.M_ACTOR_N_TYPE <> 1
AND OBJ_M_ACTORLINK.M_ACTL_N_FATLINKID = GroupLink.M_ACTL_N_ID
AND GroupName.M_ACTOR_N_ID = GroupLink.M_ACTL_N_ACTORID