Oracle Database Discussions

I create an ODBC connection to SQLite  as in thread Creation db link to Sqlite?

file initdg4odbc.ora

#
 # HS init parameters # HS_FDS_CONNECT_INFO = SQLITE2ORACLE
 HS_FDS_TRACE_LEVEL = 4
 #
 # Environment variables required for the non-Oracle system # #set <envvar>=<value>

tnsnames.ora in network\admin:

dg4odbc  =   (DESCRIPTION=     (ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1524))     (CONNECT_DATA=(SID=dg4odbc))     (HS=OK)   ) 

listener.ora in the same folder:

SID_LIST_LISTENER=   (SID_LIST=       (SID_DESC=          (SID_NAME=dg4odbc)          (ORACLE_HOME=D:\ora11\product\11.1.0\db_1)          (PROGRAM=dg4odbc)       )   )

I created an table in Sqlite:

create table table1(col integer)
insert into table1 values (1)

Using this the above configuration I successfully create a working database link:

create database link test using 'dg4odbc';

This SQL runs correctly:

Select * FROM table1@test;

the above select returns the correct values.

However I can't run the following SQL :

select col from table1@test;

00904. 00000 -  "%s: invalid identifier"

Does anybody knows why can't I have named columns in the sql statement?