Status of Partially paid event contributions can't be changed to cancelled or refunded even if the payments on the event have been cancelled or refunded

We would like to see support for Partial Payment contribution status transitions (currently not included in the chart here: http://wiki.civicrm.org/confluence/display/CRM/CiviAccounts+Data+Flow#CiviAccountsDataFlow-SupportedStatusTransitions)

Ideally one should be able to change the status from "partially paid" to "cancelled", "completed", or "refunded".

It would be nice if the contribution status was also automatically changed to "cancelled" or "refunded" if the payment status on the event record is changed respectively.

To reproduce:

• make a partial payment on an event registration
• refund the payment, and set the status to 'refunded'
• go to the related contribution, you will see it still shows "partially paid"
• try to change the status of the contribution to "cancelled", "completed", or "refunded" and you will find you get a notice saying you can't change the status so long as the paid amount is different from the amount due (even though due should = 0 if the registration has been cancelled)

Our workaround for now is to keep the contribution status as 'partially paid' but manually change the contribution amount to $0 - I'm not sure if this is ideal or if there are any issues with doing this that I should be made aware of.