Paradox primary indexes

I want to create a paradox table at run time and I want to set a primary key for first two fields an error occured while I attempt to do that, this is the function wich produce an error:

function CreateTrafficTable: Boolean;
  NewTable: TTable;
  Result:= False;
  NewTable := TTable.Create(nil); // Create table object
  with  NewTable  do
    Active := False;
    TableName := ExtractFilePath(ParamStr(0)) + 'Traffic.db';
    TableType := ttDefault; // Paradox

    (*** Create fields  ***)
    FieldDefs.Add('Date of Issue', ftDateTime, 0, True);
    FieldDefs.Add('Record Period From', ftTime, 0, True);
    FieldDefs.Add('Record Period To', ftTime, 0, True);
    FieldDefs.Add('Result List', ftString, 10, True);
    FieldDefs.Add('TrunkGroupList', ftString, 40, True);
    FieldDefs.Add('Avle', ftInteger, 0, True);
    FieldDefs.Add('Seiz', ftInteger, 0, True);
    FieldDefs.Add('Answ', ftInteger, 0, True);
    FieldDefs.Add('Occ', ftFloat, 0, True);
    FieldDefs.Add('Conv Occ', ftFloat, 0, True);
    FieldDefs.Add('Thrsw', ftInteger, 0, True);
    FieldDefs.Add('Call Att', ftInteger, 0, True);
    FieldDefs.Add('Cong', ftInteger, 0, True);
    FieldDefs.Add('Offd Atg', ftInteger, 0, True);

    (*** Create primary key ***)
    IndexDefs.Add('ix1', 'Date Of Issue', []);
    IndexDefs.Add('idx2', 'Record Period From', []);

    (*** Create physical table ***)
    Result:= True;

  end ; // With NewTable

Thanks for advance,
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this q is posted twice, delete this
If i recall right you should use

IndexDefs.Add('ix1', 'Date Of Issue', [ixprimary]);
there can only be ONE primary key in a table!!
try this
with IndexDefs do begin
               // first key has no name, because it's the primary
               Add('', 'COF', [ixPrimary, ixUnique]);

hope this will help

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