Let's try to simplify and clean this up first. You can remove the AND NOT DELETED() if you already have SET DELETED ON.

WITH THISFORM
   .cboQuadra.ROWSOURCETYPE = 3
   .cboQuadra.ROWSOURCE = "SELECT nome_num, codigo FROM quadras ;
      WHERE NOT DELETED()AND cod_loteamento = ?cCBO1_Value ;
      order by nome_num INTO CURSOR cur_quadras"

   .cboLote.ROWSOURCETYPE = 3
   .cboLote.ROWSOURCE = "SELECT numero, codigo FROM lotes ;
      WHERE lotes.Status = stat_venda AND NOT DELETED() ;
      AND cod_quadra = ?cCBO2_Value order by numero INTO CURSOR cur_lotes"
ENDWITH

In the InterActiveChange of Combo1:

DoDefault()
local cCBO1_Value
cCBO1_Value = This.DisplayValue()
This.Parent.cbo2.Requery()

In the InterActiveChange of Combo2:

DoDefault()
local cCBO2_Value
cCBO2_Value = This.DisplayValue()
This.Parent.cbo3.Requery()

>I have 3 combos in a form (cbo1, cbo2, cbo3)the second combo cbo2 value depends ond the value chossen in cbo1 and the same happends with cbo3.
>
>When I move the pointer in the table, I allways rebuild the cursors on which cbo2 and cbo3 are based calling a function.
>
>The function is below:
>
>* Get value of combo1 to update cbo2
>SELECT("v_clientes_")
>cbo1 = v_clientes_.loteamento
>SELECT nome_num, codigo FROM quadras WHERE DELETED() <> .T. ;
>AND cod_loteamento = cbo1 ORDER BY nome_num INTO CURSOR cur_quadras
>
>* Get value of combo2 to update cbo3
>SELECT("v_clientes_")
>cbo2 = v_clientes_.quadra
>old_area = SELECT()
>
>SELECT numero, codigo FROM lotes WHERE DELETED() <> .T. ;
>AND cod_quadra = cbo2 ORDER BY numero INTO CURSOR cur_lotes
>
>WITH THISFORM
> .cboQuadra.ROWSOURCE = "SELECT nome_num, codigo FROM quadras ;
> WHERE DELETED() <> .T. AND cod_loteamento = cbo1 ;
> order by nome_num INTO CURSOR cur_quadras"
> .cboQuadra.ROWSOURCETYPE = 3
> .cboLote.ROWSOURCE = "SELECT numero, codigo FROM lotes ;
> WHERE lotes.Status = stat_venda AND DELETED() <> .T. ;
> AND cod_quadra = cbo2 order by numero INTO CURSOR cur_lotes"
> .cboLote.ROWSOURCETYPE = 3
>ENDWITH
>SELECT("v_clientes_")
>
>*Problem is here -> when execute the next command it returns Error 1152 and *the combo disapears from the form. It seems that the Rowsource from cbo2 and *cbo3 = ""
>THISFORM.REFRESH
>
>
>* Cannot access the selected table (Error 1152)
>* You have attempted to select a table outside the 32K work area range
>* or are attempting to reference a file variable in a table that is not open.
>
>* Using VFP6.0 + SP5
>
>Does someone knows why it's happening and how to solve this ??
>
>Thanks in Advance
>
>Peter