When the funding org changes mid-month, you want the default to come from who you billed not who is currently in the case file. I understand this can be changed but it is a free form 'add' and if you don't get the funding org name exactly right you have payments from the same funding org under different names and that can get very messy. Either this way or provide a full list of the funding orgs to choose from not have it a free form 'add' of payor.