Editing an Invoice no longer working properly

When editing a previously posted invoice to amend the nominal and update it will no longer allow it, a second line (on a one line invoice) is created asking for details.

Even If you try to post that line with a zero amount and a description to bypass the issue your two lines turn into 4 lines on update asking for details for the 3 blank lines, it keeps multiplying from there, it is there seemingly impossible to edit an invoice line!