How to select a grand child on a grid ?

Sorry if this is an old question, I just start using SC8.

I have tables of 3 level:

Invoice detail

  • inv_items_id
    Items
  • item_id
  • item_type_id
    Type
  • type_id
  • Description

The SQL:

SELECT inv_items_id, items_type_id, Description FROM Invoice_Detail
INNER JOIN Items ON inv_items_id = item_id
INNER JOIN Item_type ON item_type_id = type_id
ORDER BY Description

The resulting grid is O.K, but I cannot create a search field on Description.

How to select the Description as filter and “ORDER BY” ? I use “item_type_id” and lookup Description but nothing return.

Regards,

Almond Wong