Actually when posting an invoice its description is copied to the accounting move line description.
In some cases would be great to have some specific information about invoice in move description whether it has got description or it hasn’t. As an example, in supplier invoices the supplier invoice number (reference).
Allow to customize the account move line description of an invoice with most relevant information of it: date, reference, number, party, …
The parametrization can be done in accounting journal and by default will be the invoice description (current behavior).
The account move description could be use this customization as well.