Carrier Module
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The carrier module defines the concept of carrier.

Carrier
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A carrier links a party with a product and cost method.

- The *Product* is the carrier service.
- The *Carrier Cost Method* defines how to compute the carrier cost. By default
  there is only the *Product Price* method which takes the *List Price* of the
  *Product* as sale price and the *Cost Price* of the *Product* as purchase
  price.