🚀 go-pugleaf

Hi, All

I need to RETURN a String parameter from Oracle 8.1.6.0.0 DataBAse using TADOStoredProc. When I try, I gain this erro 
message "Parameter object is improperly defined.
Inconsistent or incomplete information was provided".
When I use a ftInteger DataType it work properly but when I
use ftString don't.
This is the Stored Procedure prototype
create or replace procedure SP_CA_URAVOZ(codigo in varchar
                                         ,valido out number
                                      ,outstring out varchar)

and this is my code
    ADOSP1->Parameters->AddParameter();
    pcount = ADOSP1->Parameters->Count - 1;
    ADOSP1->Parameters->Items[pcount]->Name = "var2";
    ADOSP1->Parameters->Items[pcount]->Direction = pdOutput;
    ADOSP1->Parameters->Items[pcount]->DataType = ftString;
    ADOSP1->ExecProc();

does any one help me?

thanks in advance