ODBC experts needed!

I'm using Postgres as DBMS to store some data tables attached to 
Autocad Map drawings (maps). I've got some problems: if I try
to look at the attached table I got a strange error, here is
the odbc-driver log:

conn=101857584, query='SELECT * FROM attributo'   [ fetched 13 rows ]
conn=101857584, query='SELECT COUNT (*) FROM attributo'   [ fetched 1 rows ]
conn=101857584, query='SELECT INVALID SELECT STATEMENT TO FORCE ODBC
DRIVER TO UNPREPARED STATE'
ERROR from backend during send_query: 'ERROR:  parser: parse error at or
near "select"'
STATEMENT ERROR: func=SC_execute, desc='', errnum=1, errmsg='Error while
executing the query'               
------------------------------------------------------------                hdbc=101857584, stmt=102041176, result=0
           manual_result=0, prepare=0, internal=0                bindings=101974496, bindings_allocated=1
parameters=0, parameters_allocated=0                statement_type=0, statement='SELECT INVALID SELECT
 
STATEMENT TO FORCE ODBC DRIVER TO UNPREPARED STATE'                stmt_with_params='SELECT INVALID SELECT STATEMENT
TO
FORCE ODBC DRIVER TO UNPREPARED STATE'                data_at_exec=-1, current_exec_param=-1, put_data=0
currTuple=-1,current_col=-1, lobj_fd=-1                maxRows=0, rowset_size=1, keyset_size=0, cursor_type=0,
 
scroll_concurrency=1                cursor_name='SQL_CUR06150658'                ----------------QResult Info
-------------------------------
CONN ERROR: func=SC_execute, desc='', errnum=110, errmsg='ERROR: 
parser: parse error at or near "select"'           ------------------------------------------------------------
 henv=101850696, conn=101857584, status=1, num_stmts=16           sock=101850712, stmts=101850760, lobj_type=-999
   ---------------- Socket Info -------------------------------           socket=248, reverse=0, errornumber=0,
errormsg='(NULL)'          buffer_in=101863920, buffer_out=101868024           buffer_filled_in=50,
buffer_filled_out=0,buffer_read_in=50
 

Of course "SELECT INVALID SELECT STATEMENT TO FORCE ODBC DRIVER TO
UNPREPARED STATE"
is not a SQL command, but I don't undestand who is issuing that nor is
meaning. 
If I understand correctly, Autocad uses ADO to access databases. Any
hints?
Bye and thanks in advance
Andrea