Invoices:
Invoice { Country = Germany, BillingMethod = Paper, InvoiceCount = 4, CustomerCount = 5, Amount = 1234 }
Invoice { Country = Germany, BillingMethod = Electronic, InvoiceCount = 52, CustomerCount = 34, Amount = 4567 }
Invoice { Country = Greece, BillingMethod = Paper, InvoiceCount = 8, CustomerCount = 75, Amount = 78955 }
Invoice { Country = Denmark, BillingMethod = Paper, InvoiceCount = 32, CustomerCount = 15, Amount = 7890 }
Invoice { Country = Norway, BillingMethod = Electronic, InvoiceCount = 4, CustomerCount = 52, Amount = 65898 }
Flattened Invoices:
CountryInvoice { Country = Germany, PaperInvoiceCount = 4, PaperCustomerCount = 5, PaperAmount = 1234, ElectronicInvoiceCount = 52, ElectronicCustomerCount = 34, ElectronicAmount = 4567 }
CountryInvoice { Country = Greece, PaperInvoiceCount = 8, PaperCustomerCount = 75, PaperAmount = 78955, ElectronicInvoiceCount = 0, ElectronicCustomerCount = 0, ElectronicAmount = 0 }
CountryInvoice { Country = Denmark, PaperInvoiceCount = 32, PaperCustomerCount = 15, PaperAmount = 7890, ElectronicInvoiceCount = 0, ElectronicCustomerCount = 0, ElectronicAmount = 0 }
CountryInvoice { Country = Norway, PaperInvoiceCount = 0, PaperCustomerCount = 0, PaperAmount = 0, ElectronicInvoiceCount = 4, ElectronicCustomerCount = 52, ElectronicAmount = 65898 }