Please provide a functionality to set up a flag or alert on invoice lever and or customer level that can be used to document special handling of an invoice and or customer as appropriate.
For example: Customer A is will make a payment within 3 months for invoices in June and July, no follow up needed for the aged invoices.

Or look out for new accounting POC email address as a result of merger.

Such flag can be made active, changed to inactive, be deleted or updated.

Also this flag should display on any action attempted on the customer and or the invoice so that message in the flag is considered before the action is performed.
THank you.