To compute phase numbers for order-based planning

Criteria for phase numbers

The phase numbers of the plan units must conform to the following criteria:

• If a plan items is defined as a component of another plan item in a BOM, the phase number of the component must be greater than the phase number of the parent.
• A plan item must have the same phase number as any of the use-up materials and alternative materials of that plan item.
• If a supplying relationship exists between two plan items that belong to the same company, the phase number of the supplying item must be greater than the phase number of the receiving item.
• If a supplying relationship exists between two plan items, and both items are controlled by central multicompany planning, the phase number of the supplying item must be greater than the phase number of the receiving item.

Computation procedure

The computation of the phase numbers is an iterative process. You can choose between two methods:

• Regenerative computation
• Net-change computation

In a regenerative computation, every plan item initially gets phase number 0. LN then checks the plan items one by one and adjusts their phase numbers until the criteria for phase numbers are fully met. For information on the net-change computation see Net-change phase number computation.

You can see the result of the computation in the Order Phase Number field in the Items - Planning (cprpd1100m000) session.