anchor.diff:  'PaymentLine "0..*" <-- IncomingInvoice
   
   
  -
   --
   
   Sketched/placeholders:
  
positive.code: Organisation "  supplier" <-- Order
  
  
  ''''''''''''''''''''''''''''''''''''''''''''''
  
  
  
negative.code: 
  
  ''''''''''''''''''''''''''''''''''''''''''''''
  class DocumentSet #lightgreen {
  }
  
  class DocumentHandle #lightgreen {
  
  }
  
  enum HandleType #cyan {
  