I have the folowwing code, and it works ok in most cases:

Private Sub Worksheet_Change(ByVal Target As Range)
If ((Target.Column = 10) Or (Target.Column = 15)) Then
If Not IsEmpty(Target) Or Target < "" Then
MsgBox "The cell content has been changed"
End If
End If
End Sub

But if I delete something from a merged cell, in stead of just skipping the
cell (not displaying the messagebox) I get a "Run-Time error '13': Type
mismatch". This only happens on merged cells.

Any idea how to avoid this?

Jan