The system copies the basis for the header billing plan from Customizing. In milestone billing, the following functions are carried out at item level:
Determining billing document value on a percentage basis
Dates at header level are copied from all item billing plans assigned to that header. When you make changes at header level (e.g. new billing dates or changes to percentage rates), the related items are automatically changed accordingly. The system does not allow you to make changes at item level.
Note
Handling milestones
Dates generated in the header billing plan and milestones set in the header billing plan (
If you want to schedule milestones in an item separately from the header, you must first remove the item from the header billing plan before milestones can be assigned to it.
All manually set milestones will be deleted when you reassign this item to the header billing plan. Header data will once again be valid for the item.