container_info = cou_getContainerInfo( cnx, par_area, par_class);
container_class = container_info[0];
container_column_name = container_info[1];

__SQL_GET_INTEGER(id_this,
"SELECT id FROM co_%s_%s WHERE %s=%d AND column_number=%d",
par_area, par_class,
container_column_name, id_parent, number)
if (!ok) {
id_this=0;
}
__RETURN_INTEGER(id_this)