Generating Dates from Milestones 
Use
If you use this function, the system copies the invoicing plan data from the milestones when you create items for your invoicing plan.
In customizing, you can stipulate whether the invoicing plan data is adjusted automatically when the dates in the milestones change.
Prerequisites
The date category has been maintained in Project System customizing, step Maintain Date Category for Invoicing Plan. If you have so specified in customizing, the system adjusts the dates in the invoicing plan if the milestone dates change.
In the milestone detail screen, you must maintain the sales document date and Date key 01.

If you are working with a template, you can only use the milestone date function to generate new dates for the invoicing plan.
Procedure
This takes you to the screen for changing dates in the invoicing plan.
Dates for milestones.The system displays the dialog box Enter Selection Conditions.
The dialog box Milestones for Invoicing Plan appears.
Result
In the invoicing plan, the system takes over the date of the milestone as the invoice date and the description from the milestone key as the description.

When you define or change milestones, you must then save the WBS again. Only then can you generate or update the dates from the milestones in the invoicing plan.
If you later move dates in the schedule, the system automatically adjusts those linked to milestones, if you have so specified in customizing.