>>Valid event is fired because you press a button i.e. move focus otside the grid. It's probably reasonable not to use Grid.Valid event. You can put all validation under 'Save' button if you have one.
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>1. What if the user added 5 records and than there's a invalid data somewhere, how do I setfocus back to the 'error' record.
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If you want to use VALID event to check the entered data, you can return .F. when you catch the error and the grid will not lose the focus.

>2. What if the second row entered depend on the first and the third on the second, etc.... Example, a part use in row1 cannot appear again in combobox of row2. Or the total sum of 'qty deliver' cannot exceed 'qty on hand'.
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>In short, it's not user friendly to have the user keyin everything then finally realise the errors and redo everything again.

It probably is better using BeforeRowColChanged to check the entered data.