Invoice Number field isn't displayed

Hi, after i installed last version i can see that “invoice number” isn’t displayed when i try to create a new invoice:

the source page infact si incomplete:

"


Invoice Number:
* "

The invoice number is an autonumber field. So the textbox doesn’t appears.

It will also not display a number as this is a new invoice and has not been saved yet resulting in not having a invoice number, once it is saved it should have a invoice number.