I am from DTFShared Service Centre which is located in Perth, Western Australia. We are using Clarity from September2009 in PMO for the Whole of Government reform program. Recently we are having problems in our timesheet processing. Historical timesheet can be edited after the point at which the contractor invoice has been prepared. Its causing confusion to the contractors team and can't approve the payment. So is there anyway we can set a rule that no one can amend the timesheet once this is approved. Can anybody please help me?