unique and progressive document number

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The mandatory elements to be included in the invoice (and in any other document pertaining to invoicing) are, therefore:

Seller's general information
name and surname / denomination
address
VAT number
Tax ID code
buyer's general information
name and surname / denomination
address
VAT number (if applicable)
tax code (always, even if the same as the VAT number)
progressive date of issue
description of the goods or services sold, with specific indication of
quantity of goods and/or services sold
unit price
any discounts applied
total sales amount of each product and/or service (unit cost X quantity sold – discount)
VAT rate applied
any additional costs
any general discounts
indication of the total amount of VAT broken down by rate
description with VAT law article for any exemption (for example because the issuer is in the Flat-Rate Regime, because it involves sales to another EU country, etc.)
indication of the amount of the total compensation, the total VAT netherlands email list and any total of the amounts exempt from VAT to be paid net and gross of VAT
any additional notes
payment method (one-off payment, monthly installments, etc.)
bank to make the payment to
any communications related to the customer (for example, reference to a previous order, or indication of a partial delivery of goods/services).
The good thing about using invoicing software is that you can automate many of the steps above, for example by avoiding having to enter the progressive number of the invoice each time or by creating a price list/catalogue that allows you to enter the unit cost and VAT rate simply by recalling the code of the good/service.

And all the other documents that are part of the invoicing?
Once the overview of the invoice is exhausted, in this paragraph I will list the other documents that make up the invoicing process, distinguishing them by type and specifying what they are for and what additional (or less) data should be entered.

The advance invoice
An advance invoice is a normal invoice which, however, with the buyer's approval, is issued before the normal invoicing obligation (and therefore before the object of the agreement on which the sale is based is realised).