account-financial_reporting: general ledger, create a grouping to have a single line per invoice

[MaurizioPellegrinet]

Is your feature request related to a problem?
Problem: general ledger show me only row that I have in invoice, if I choose "centralization" I have the report without the ref. of invoice by months.

Describe the solution you'd like
Create a grouping to have a single line per invoice

Additional context
It is very important for accountant for simply control, also because the company must be conserve the general ledger which must be easy to read