Importing Status Flags for Deleted Credit Notes

This is in response to customer feedback about credits that have been deleted within the accounting system still show as active within the CRM.

Currently, there is no solid way to remove these from the system as imports just bring them straight back in. At the moment , the only thing the system does to counter act this is to mark the pricing, net, etc as negative. This has been throwing off financial analysis for a couple of customers.