The change statuses of your routing are defined as in the graphic below. You delete change status 2 online (red cross in the graphic).

The change statuses 5 and 8 can no longer be edited, since they both are completely within the validity period of change status 2.

Change statuses 4, 6, 7, 9 and 11 can, however, be partially edited, for instance the material component allocation before 10/01/1998 and after 12/01/2000.