Tryton Application Platform (Purchase Invoice Line Standalone Module)

 Tryton is a high-level general purpose application platform. It is the base
 of a complete business solution as well as a comprehensive health and hospital
 information system (GNUHealth).
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 This module adds the possibility to change the behaviour of purchase orders
 to create standalone invoice lines instead of a complete invoice. This allows
 one to compose invoices with lines originating from different purchases.