Example: OCM differs by additional element

Source OCM                         Destination OCM
A {1,1} (,)                               A {1,1} (,)
     B {1,1} (|)                                   X {1,1} (|)
          #text                                           #text
          C {1,1} (|)                              B {1,1} (|)
               #text                                      #text
                                                           C {1,1} (|)
                                                              #text

This operation fails.