Update invoice description

Hello

We have 'Allow adjustments to paid invoices' option enable on Invoice Option setting on the system that we have been using for years.

Users want to disable this option to prevent amending the paid invoice but they still want to be able to amend invoice description to add further information in the description box such as when they receive a credit note, bounced back payment etc.

I believe when 'Allow adjustments to paid invoices' option disable on Invoice Option setting then we cannot amend anything at all including description, is this correct? Could you please advise if there's any solution for this?