Invoicing is not working in trunk

[Jacopo Cappellato]

Hi all,

I'm having problems to create a sales invoice from an order.
The error is a NPE at line 207 of InvoiceServices:
String billFromVendorPartyId = orh.getBillFromParty().getString("partyId");

So the problem seems caused by the missing role in the order... any 
suggestion of what could have caused this?

Thanks,

Jacopo