Is your feature request related to a problem?

In some cases, importing an incoming e-invoice will show an error message stating that the user doesn't have the necessary group to edit a certain field (in my case it was stock_valuation_layer_ids and the user was missing the "Stock / Administrator" group)

Describe the solution you'd like

After a bit if investigation I found out that all the fields of the invoice were being overwritten. For many of them the new value was the same as the old one.
I'd like a check to overwrite only those fields with different values

• 16.0
• 14.0 [14.0][IMP]l10n_it_fatturapa_in: copy changing values only #4240