Tryton Application Platform (Purchase Module)

 Tryton is a high-level general purpose application platform written in Python
 and using PostgreSQL as database engine. It is the core base of a complete
 business solution.
 .
 This module adds the possibility to define purchase orders, to add product
 supplier and purchase information, and to define the purchase price as the
 supplier price or the cost price.
 .
 With the possibilities:
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  * to follow invoice and packing states from the purchase order.
  * to define invoice method: Manual, Based On Order, Based On Packing.