Execute Function in external ORACLE Database

Hi Gurus,
I'm working with Native SQL, trying to execute a function (NOT a procedure) present in an Oracle Database.
I have the DBCO table ready and the conection is working fine, but when I want to execute the function I get the following error (with short dump):
Database error text: "ORA-00900: invalid SQL statement"
Database error code: 900
Triggering SQL statement:
:VALIDO := cai_valido_i   ? , ? , ? , ? , ? , ? )"
Looks like this is a syntax error when i'm trying to use the function. I try to call the function with EXECUTE PROCEDURE, but another error appear, saying that the procedure doesn't exist.
This is the function that I need to call in Oracle:
cai_valido_i
   (ccai in number,
    ccuit in number,
    cfecha in date,
    ccod_tc in number,
    cpto_vta in number,
    cnro in number)   return number
I Hope somebody can help me with this.
Kind regards,
Roberto.-

Not sure how to call Functions but I executed procedures as below:
EXEC SQL PERFORMING <SAP_SUBROUTINE>.
    SELECT <PROCEDURE>(
           :<IN_PAR1>,
           :<IN_PAR2>,
           :<IN_PAR3>)
      INTO :<OUT_PAR1>
      FROM DUAL
ENDEXEC.
Thnaks,
Shashi Reddy

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M relno      7000
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http://help.sap.com/saphelp_nwpi71/helpdata/en/df/455ec9747111d6b25100508b6b8a93/content.htm
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