Electronic Documents in SAP Business One - how to?

Good morning experts,

first of all: I apologize for my bad english.

I've installed into SAP B1 the .spp file requested for the creation of an .xml file that is necessary for the documents necessary to the italian public administration.

I need to know what I have to do to show the output .xml: how can I see the .xml of a sell invoice?

I'm using SAP B1 9.0 PL16.

Regards,

Michele