Confirmation Directly in the Project System 
Use
You can use this function to make confirmations in the Project System(PS).
Prerequisites
You can only confirm activities and activity elements, if
You must have defined certain confirmation parameters in Customizing for the Project System previously. Here you specify in Confirmation ® Define confirmation parameters, for instance, how much the confirmed work or duration may differ from the values planned in the activity and whether a workflow is triggered if this margin is exceeded. You can change some of these parameters during confirmation.
Features
You enter confirmation in the following ways:
You can enter the following data during confirmation:
If you enter a personnel number in the confirmation, the system creates a data record for Time Management, which can be processed further when you enter incentive wages or by using report program RPWI0010 (Batch Input for activity wages).
When you confirm an activity that has material components assigned to it that are to be backflushed, the system automatically posts the goods issue for these components. If the goods cannot be issued, you receive, depending on the confirmation parameters in Customizing, an error message or an error log. You can reprocess goods issues that have errors and:
You can trigger milestone functions or a Workflow when you confirm an activity. See
Triggering Milestone Functions and Triggering WorkflowsYou can also create a pool of confirmations, which you can use for further confirmations. See
Pool of Confirmations CreationActivities
After you have saved the confirmation, the system
According to your settings in Customizing, the system executes these activities immediately or later in a background job, which can improve performance. For details on this function, see
Decoupling Processes Carried out During Confirmation and the IMG for
confirmation in the Project System.You have to reprocess goods issues that have errors, if any have occurred.

When you save confirmations, the networks are not rescheduled and they do not receive the Dates are not updated status.