After posting a customer invoice, going into the document it’s not possible to add any free text and also field invoice description is not editable.

This is very strange as it could happens that for a claim you need to write something in it, when you send account statement to client this must be visible.

It is quite common request and all other systems (like SPA, Infor, Oracle) I see the editable text is there.

Then, a new text field on the header of invoice just to add some text is required.