Problemas al insertar en una tabla

[vhirginia]

Este es el codigo de la unidad en la que estan incluidos los botones para insertar,modificar ,mostrar y eliminar(un cliente)que representan a 4 unidades distintas.

[code]
unit Unit9;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, DBCtrls, Db, DBTables, Grids, DBGrids, jpeg, StdCtrls, Menus,
Buttons;

type
TForm9 = class(TForm)
Label1: TLabel;
Image1: TImage;
BitBtn1: TBitBtn;
BitBtn2: TBitBtn;
BitBtn3: TBitBtn;
BitBtn4: TBitBtn;
MainMenu1: TMainMenu;
Archivo1: TMenuItem;
Nuevo1: TMenuItem;
Modificar1: TMenuItem;
Eliminar1: TMenuItem;
Mostrar1: TMenuItem;
Salir1: TMenuItem;
Ayuda1: TMenuItem;
Acercade1: TMenuItem;
BitBtn5: TBitBtn;
Tabla_clientes: TTable;
DataSourceclientes: TDataSource;
procedure Acercade1Click(Sender: TObject);
procedure Salir1Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure BitBtn1Click(Sender: TObject);
procedure Nuevo1Click(Sender: TObject);
procedure BitBtn4Click(Sender: TObject);
procedure Mostrar1Click(Sender: TObject);
procedure BitBtn2Click(Sender: TObject);
procedure Modificar1Click(Sender: TObject);
procedure BitBtn3Click(Sender: TObject);
procedure Eliminar1Click(Sender: TObject);
procedure BitBtn5Click(Sender: TObject);
procedure Tabla_clientesAfterPost(DataSet: TDataSet);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form9: TForm9;

implementation

{$R *.DFM}
uses Unit4, Unit3, Unit23, Unit25, Unit26, Unit27;

procedure TForm9.Acercade1Click(Sender: TObject);
begin
Form4.Visible:=True;
end;

procedure TForm9.Salir1Click(Sender: TObject);
begin
Form9.Visible:=False;
end;

procedure TForm9.Button1Click(Sender: TObject);
begin
Form3.Visible:=True;
Form9.Visible:=False;
end;

procedure TForm9.BitBtn1Click(Sender: TObject);
begin
Form23.Visible:=true;
Form9.Visible:=False;
Tabla_clientes.Insert;
end;

procedure TForm9.Nuevo1Click(Sender: TObject);
begin
Form23.Visible:=true;
end;

procedure TForm9.BitBtn4Click(Sender: TObject);
begin
Form25.Visible:=true;
Form9.Visible:=false;
end;

procedure TForm9.Mostrar1Click(Sender: TObject);
begin
Form25.Visible:=true;
Form9.Visible:=false;
end;

procedure TForm9.BitBtn2Click(Sender: TObject);
begin
Form26.Visible:=true;
Form9.Visible:=false;
Tabla_clientes.Edit;
end;

procedure TForm9.Modificar1Click(Sender: TObject);
begin
Form26.Visible:=true;
Form9.Visible:=false;
end;

procedure TForm9.BitBtn3Click(Sender: TObject);
begin
Form27.Visible:=true;
Form9.Visible:=false;
Tabla_clientes.Delete;
end;

procedure TForm9.Eliminar1Click(Sender: TObject);
begin
Form27.Visible:=true;
Form9.Visible:=false;
end;

procedure TForm9.BitBtn5Click(Sender: TObject);
begin
Form9.Visible:=False;
Form3.Visible:=True;
end;

procedure TForm9.Tabla_clientesAfterPost(DataSet: TDataSet);
begin
Tabla_clientes.Insert;
end;

end.
[code]


Lo siguiente es el codigo de la unidad de dar de alta un nuevo cliente:

[code]
unit Unit23;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, StdCtrls, Db, DBTables, DBCtrls, Mask;

type
TForm23 = class(TForm)
Label1: TLabel;
Image1: TImage;
Label2: TLabel;
Label3: TLabel;
Label4: TLabel;
Label5: TLabel;
Label6: TLabel;
Label7: TLabel;
Label8: TLabel;
Button1: TButton;
Button2: TButton;
Label9: TLabel;
DataSourceclientes: TDataSource;
Tabla_clientes: TTable;
Tabla_edificios: TTable;
DataSourceedificios: TDataSource;
GroupBox1: TGroupBox;
Label10: TLabel;
Label11: TLabel;
Label12: TLabel;
DBEdit1: TDBEdit;
DBEdit2: TDBEdit;
DBEdit3: TDBEdit;
DBEdit4: TDBEdit;
DBEdit5: TDBEdit;
Tipo: TDBRadioGroup;
DBEdit6: TDBEdit;
DBEdit7: TDBEdit;
DBEdit8: TDBEdit;
DBLookupComboBox1: TDBLookupComboBox;
DBLookupComboBox2: TDBLookupComboBox;
DBLookupComboBox3: TDBLookupComboBox;
procedure Button2Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Tabla_clientesAfterPost(DataSet: TDataSet);
procedure Tabla_edificiosAfterPost(DataSet: TDataSet);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form23: TForm23;

implementation

{$R *.DFM}

uses Unit9, Unit24;

procedure TForm23.Button2Click(Sender: TObject);
begin
Form23.Visible:=false;
Form9.Visible:=true;
end;

procedure TForm23.Button1Click(Sender: TObject);
begin
Tabla_clientes.Post;
Form23.Visible:=false;
Form24.Visible:=true;
end;

procedure TForm23.Tabla_clientesAfterPost(DataSet: TDataSet);
begin
Tabla_clientes.FlushBuffers;
end;

procedure TForm23.Tabla_edificiosAfterPost(DataSet: TDataSet);
begin
Tabla_edificios.FlushBuffers;
end;

end.
[code]