anchor.diff:  
   }
   
  +class PaperclipForBankAccount #lightgreen {
  +
  +}
  +
  +
   
   
   class IncomingInvoiceItem #pink  implements FinancialItem  {
  
positive.code:     project: Project
  }
  
  Order <--> "0..*" OrderItem
  
  
  Party "buyer" <-- Order
  Party "seller" <-- Order
  
  
  
  
  
negative.code: 
  
  BankAccount <-- IncomingInvoice
  
  Document <-- "0..1         " PaperclipForBankAccount
  BankAccount <-- PaperclipForBankAccount
  
  
  class Document #lightgreen {
  