If you access the customizing for shipping data, then you see a list of plants.
Each plant is just once in that list.
Hence all data that you enter in the detail are related to this plant.
On top is the customer number. This is the customer number for this plant. This customer number is used from any other plant who does a delivery to this plant.
in the lower part you see the sales area that is assigned to this plant .
This is the sales are that is used if you ship anything from this plant
Example: if you have 2 plants, 0001 and 0002, and 0002 only receives material shipped from 0001,
then you only need to enter a customer number in plant 0002
and you need to enter the sales area in plant 0001 only.
a storage location is just one level beneath the plant.
but the customizing uses the same logic and does certainly not twist it