2010/01/01 A Donation to Project Foo
   Income:Foo:Donation   $-100.00
      ;INVOICE: Projects/Foo/Invoices/Invoice20110315.pdf
   Assets:Checking       $100.00


2011/03/15 A Later Donation to Project Foo
   Income:Foo:Donation   $-400.00
   Assets:Checking       $400.00

2011/04/20 (1) A Later Donation to Project Foo
   Expenses:Foo:Hosting   $250.00
      ;RECEIPT: Projects/Foo/Expenses/hosting/AprilHostingReceipt.pdf
   Assets:Checking       $-250.00

2011/05/10 Donation to General Fund
   Income:Donation   $-50.00
      ;INVOICE: Financial/Invoices/Invoice20110510.pdf
   Assets:Checking   $50.00