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1) Can you describe Data Validation ?
This allows you to create restrictions on the type of data that can be entered in a cell.

2) How can I stop the user pasting over data validation ?
Data validation will prevent incorrect values being typed into a cell.
If will not prevent the user from pasting an incorrect value into the cell.
You can prevent this from happening by writing a VBA macro.
This code detects when cells are changed, checks if data validation is present and stops the paste taking place.

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Copy the following VBA code and paste it into the corresponding worksheet code module.

Private Sub Worksheet_Change(ByVal Target As Range) 
    If AllCellsHaveValidation(Range("B2:B8")) Then
        Exit Sub
        Call MsgBox("You cannot paste data over cells with Data Validation." & _
                    vbCrLf & vbCrLf & _
                    "Please use the drop-down to enter data.", vbCritical)
    End If
End Sub

Private Function AllCellsHaveValidation(rgeCells) As Boolean
    On Error Resume Next
    rgeCells = rgeCells.Validation.Type
    If Err.Number = 0 Then
       AllCellsHaveValidation = True
       AllCellsHaveValidation = False
    End If
End Function

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