**Steps to reproduce:**
- Install l10n_it_edi_ndd
- Switch to an Italian company (e.g. IT Company)
- Create an invoice
- Confirm the invoice
=> Document Type (in "Electronic Invoicing" tab) is computed
- Create a credit note from the invoice
- On credit note wizard, click on "Reverse and Create Invoice"
- Check the created credit note

**Issue:**
The credit note is posted but its Document Type field (l10n_it_document_type) is empty.
l10n_it_document_type should be computed when it doesn't have a value already and the state of the move is "posted".
The credit note will be rejected when sent to SDI because this field is empty.

**Cause:**
In the reverse method, the field is set to False in order to be recomputed.
However, the compute method is triggered when the state changes, but the credit note not is already posted.
Therefore the field will not be recomputed.

**Solution:**
Set the value to False before the creation of the credit note.
So that, the field will be recomputed when posting the credit note.

opw-4689755




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Forward-Port-Of: odoo/odoo#210361
Forward-Port-Of: odoo/odoo#208654