Sub lettrage()
Application.ScreenUpdating = False
Dim derlig As Long
   With Worksheets("Autres fournisseurs")
    
       derlig = .Range("a" & Rows.Count).End(xlUp).Row
       .Range("E2:E" & derlig).ClearContents
    
       For i = 2 To derlig
                        
           For j = i + 1 To derlig    '
               If .Cells(i, 5) = "" And .Cells(i, 6) > 0 Then
                 If .Cells(i, 3) = .Cells(j, 3) And .Cells(i, 6) = .Cells(j, 7) Then
                   .Cells(i, 5) = "A"
                   .Cells(j, 5) = "A"
                 End If
               End If
            Next j
        Next i
    End With
Application.ScreenUpdating = True
End Sub