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	Hallo, 
	vielleicht hilft dieser VBA-Code weiter? 
Private Sub Workbook_SheetChange(ByVal sh As Object, ByVal Target As Range)
    Debug.Print "Beginn"
    Static bDoIng As Boolean
    If Not bDoIng Then
        bDoIng = True
        Debug.Print "Beginn Intern"
        Dim rng As Range
        Set rng = getProtectedRange
        If Not Intersect(Target, rng) Is Nothing Then
            Debug.Print "A"
            With Target
                ActiveSheet.Unprotect Password:="123"
                .Cells(Target.Row, 3).Value = Format(Date, "dd.mm.yyyy")
                .Cells(Target.Row, 3).Locked = True
                Target.Locked = True
                ActiveSheet.Protect Password:="123"
            End With
        End If
        bDoIng = False
    End If
End Sub
Function getProtectedRange() As Range
    Dim rngProtect As Range
    Dim nm As Name
    Dim sRngs() As String
    Set nm = ActiveWorkbook.Names("Schutz")
    
    Dim sRng As String, iPos As Integer
    sRng = nm.RefersTo
    If InStr(sRng, ",") > 0 Then
        sRngs = Split(sRng, ",")
        Set rngProtect = Range(sRngs(0))
        For iPos = 1 To UBound(sRngs)
            Set rngProtect = Union(rngProtect, Range(sRngs(iPos)))
        Next
    Else
        Set rngProtect = nm.RefersToRange
    End If
    Set getProtectedRange = rngProtect
End Function
	Es müssen in der Tabelle im Namen "Schutz" erst alle Zellen markiert werden, in denen Eingaben erlaubt sind. 
	Eine Muster-Arbeitsmappe kann hier heruntergeladen werden. 
	LG, Ben 
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