[FLOW3-general] complex object via form

[Federico Bernardin]

Hi,
I've this situation:

First entity:
 Invoice with properties, one property is the reference one to many named items

Second entity:
InvoiceItems with properties, one property is the reference one to one named invoice

I want to create a form with invoice data and the items of invoice (each item is a description of a row of invoice).
I created a button to add unlimited number of row (with javascript), so the form has unlimited list of items.

How can pass a single Invoice object with invoiceitems into a single post of the form? 

can you help me?

Thanks
Federico