XeroAPI/Xero-Net — pull request #22 by jamiepenney (2014-09-04 10:18:57+00:00)
Title: Add PlannedPaymentDate to Invoice model

http://developer.xero.com/documentation/api/invoices/#title1 Invoices have a property called PlannedPaymentDate, which is the AP equivalent of ExpectedPaymentDate. I added it to the Invoice model, which is enough to have it round-tripped from the API.