Ok Liam...

The other query:

&& Delete type's holidays.
Delete From BuyHolidays Where idBuy == BuyType.idBuy
Delete In BuyType

&& Go to top and reload the holidays.
Go Top In BuyType
Select * From BuyHoliDays ;
Into Cursor curHolidays ;
Where idBuy == BuyType.idBuy And !Deleted('BuyHoliDays')
...
...
After this, the curHolidays is empty, but if I quit of the form and open it again the query work fine. And there are more than one Holiday in the table for the first BuyType (go top).