Master planning versus order planning

Enterprise Planning offers two basic planning concepts:

Master planning

Roughly comparable to traditional MPS planning
Planning data is recorded in terms of time buckets (plan periods)
Supply is planned in the form of a supply plan, containing supply quantities by plan period
If you use master planning for production planning, only critical materials and critical resource capacity are taken into account

Order planning

Roughly comparable to traditional MRP planning
Planning data is recorded on a second-by-second basis
Supply is planned in the form of planned orders
If you use order planning for production planning, all necessary materials and all necessary resource capacity are taken into account

For each plan item, you can either choose one of these methods for supply planning, or combine them.

Item master plan

An item master plan contains item-specific planning information by plan period.

Master planning requires an item master plan. However, master-plan functionality is not confined to master planning:

Some types of master-plan data (demand forecasts, inventory plans) can also be used as input for order planning.
An item master plan supports functionality that is not available otherwise.

If you plan all supply for an item by order planning, an item master plan is optional.

On the one hand, an item master plan gives access to functionality that is not available otherwise. On the other hand, item master plans have an adverse effect on system performance. Therefore, you should only maintain an item master plan if you need specific master-plan functionality.

Note

You determine whether an item master plan is maintained for an item by means of the Maintain Master Plan check box in the Items - Planning (cprpd1100m000) session. Master-plan functionality is only available for an item if this check box is selected.

Combinations

For each plan item, you can choose between the following combinations:

Supply planned by order planning; no item master plan
Supply planned by order planning; item master plan
Short-term supply planned by order planning, and long-term supply planned by master planning; item master plan
Supply planned by master planning; item master plan

The following sections contain a diagram that explains each of the previously mentioned combinations.

Supply planned by order planning; no item master plan

A	Item order plan
B	Order horizon
C	Planning horizon
x	Current date

In this situation, basic functionality is available for:

Demand forecasting
ATP
Component CTP
Inventory planning

Supply is planned in the form of planned orders.

Supply planned by order planning; item master plan

D	Item master plan
A	Item order plan
B	Order horizon
C	Planning horizon
x	Current date

In this situation, advanced functionality is available for:

Demand forecasting and forecast generation
ATP and CTP
Inventory planning and inventory-plan generation

Supply is planned in the form of planned orders.

Supply planned by order planning and master planning; item master plan

D	Item master plan
A	Item order plan
E	Master planning horizon
B	Order horizon
C	Planning horizon
x	Current date

In this situation, advanced functionality is available for:

Demand forecasting and forecast generation
ATP and CTP
Inventory planning and inventory-plan generation

Within the order horizon, supply is planned in the form of planned orders. Within the master-planning horizon, supply is planned in the form of a supply plan.

Supply planned by master planning; item master plan

D	Item master plan
E	Master planning horizon
C	Planning horizon
x	Current date

In this situation, advanced functionality is available for:

Demand forecasting and forecast generation
ATP and CTP
Inventory planning and inventory-plan generation

Supply is planned in the form of a supply plan.