invoices: "P" and "I"

[Jannick Asmus]

Hi,

>> what do the attributes "P" and "I" of invoices exactly mean? What effect
>> does a switch between them have?

> IIRC, they mark a txn as either "Payment" or "Invoice".  

What exactly does that mean? Maybe there is some link to some documentation?

> I wasn't aware that you could change them manually.

Easy from P to I, but reverse it seems to be a difficult. I had to 
"erase" a part of a booking to amend the accounting method.

J.