Hi
Searched in the help library. Please have a look at the 9.0 documentation about this feature: http://help.sap.com/saphelp_sbo900/helpdata/en/ca/080f4f7ad8498b9a39eae01f95764c/content.htm?frameset=/en/4c/b87046766e4…
On the left are many subtopics about cancellation.
Best,
San