ColAttribute not implemented?

Hi everybody,
after some computing I found my psqlodbc filled with these errors (well,
after 10 minutes the psqlodbc log was more than 4 MB...):

CONN ERROR: func=PGAPI_ColAttributes, desc='', errnum=0, errmsg='(NULL)'
            ------------------------------------------------------------
            henv=103876384, conn=103857648, status=1, num_stmts=16
            sock=103876112, stmts=103876032, lobj_type=-999
            ---------------- Socket Info -------------------------------
            socket=900, reverse=0, errornumber=0, errormsg='(NULL)'
            buffer_in=103868584, buffer_out=117047360
            buffer_filled_in=264, buffer_filled_out=0, buffer_read_in=264
STATEMENT ERROR: func=PGAPI_ColAttributes, desc='', errnum=28, errmsg='ColAttribute for this type not implemented yet'
                 ------------------------------------------------------------
                 hdbc=103857648, stmt=103875360, result=103875808
                 manual_result=0, prepare=0, internal=0
                 bindings=103874672, bindings_allocated=4
                 parameters=0, parameters_allocated=0
                 statement_type=0, statement='SELECT * FROM "attributo" WHERE "idFSV" =1171'
                 stmt_with_params='SELECT * FROM "attributo" WHERE "idFSV" =1171'
                 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_CUR06310320'
                 ----------------QResult Info -------------------------------
                 fields=103875776, manual_tuples=0, backend_tuples=117055568, tupleField=117055568, conn=103857648
                 fetch_count=0, fcount=7, num_fields=4, cursor='(NULL)'
                 message='(NULL)', command='SELECT', notice='(NULL)'
                 status=8, inTuples=0

The "attributo" table is (from PgAdminII definition pane):

CREATE TABLE "attributo" (
  "nome" varchar(30) NOT NULL,
  "idFSV" int4 NOT NULL,
  "tipo" int2 NOT NULL,
  "id_enum" int4,
  CONSTRAINT "attributo_pkey" PRIMARY KEY ("nome", "idFSV"),
  CONSTRAINT "<unnamed>" FOREIGN KEY ("id_enum") REFERENCES "enumerazione" ("id_enum") ON DELETE CASCADE ON UPDATE NO
ACTIONNOT DEFERRABLE INITIALLY IMMEDIATE,  
  CONSTRAINT "<unnamed>" FOREIGN KEY ("idFSV") REFERENCES "datoFSV" ("idFSV") ON DELETE CASCADE ON UPDATE NO ACTION NOT
DEFERRABLEINITIALLY IMMEDIATE 
);

Mmm.... what can I do to stop this flooding of errors? I think that this could
harm performance even when psqlodbc log is turned off, isn't it?
I'm using Postgres 7.1.3 and driver version 07.01.0011 (that's what
I read from the psqlodbc log, at least...).
Best regards
Andrea Aime

BTW: I see the same error on other tables, that are using the
same datatypes as "attributo"