Multi-Plant/Site Planning 
Use
Using multi-plant planning, you can carry out material requirements planning for various plants centrally. This planning procedure facilitates the production of a product in another plant and it also guarantees a smooth flow of materials between different plants.
Integration
- In MRP, multi-plant planning is carried out by means of special procurement keys. You assign the special procurement key to the material in the material master.
- In Customizing for MRP, you define the special procurement key in the IMG activity Define special procurement type (see also Procurement Type and Special Procurement Type). You define the special procurement key at the material level according to plant, procurement type and special procurement
If required, you can also use the indicators Phantom item, Direct production, Direct procurement and Withdrawal from alternative plant to control the treatment of the material as a component during the BOM explosion.
A material appears in several BOMs as a component because it is installed in finished products in in-house production. As such, it is procured from an alternative plant.
The same material, on the other hand, is also sold from stock to customers, who need the material as, for example, a replacement part. In this case, the material cannot be procured by withdrawing it from an alternative plant. If a material shortage occurs after you have entered a customer requirement, a stock transfer purchase requisition is created in the planning run.
You can do this in the SAP system by creating a special procurement key for a withdrawal from an alternative plant and by entering a U for stock transfer in the Special procurement key and by entering the plant from which the material is to be transferred (see also Customizing Settings for Multi-Plant/Site Planning).
- Materials that are included in multi-plant planning must have a material master in all plants concerned.
When carrying out the planning run you must pay attention to the chronological planning sequence of the various plants: plan the receiving plants first and then the supplying or production plants.
If special procurement keys for stock transfer that refer to each other have been created for a material at two plants, after having carried out the planning run for both plants, you must carry it out again for the first plant.
Features
You can use the following multi-plant procedures:
- Stock transfer from plant to plant or from plant to MRP area
- Production in alternative plant
- Withdrawal from alternative plant