I am on apps 11i. as part of requirement, i have to end date the usage line with in the contract life cycle. i.e for example, subscription contract starts from 01-jan-2013 to 31-Dec-2013, and usage lines also with the same effectivity dates. After some time i want to end date the one of usage line to 31-jun-2013. in this case how to proceed with this contract? Any changes have to do with the counter instance attached with the usage item? how to prevent the billing for customer for this usage line?