Inactive bank accounts can be used as the Pay Only From Bank option on the Define Vendor page. When you make a bank account inactive that was already set as the pay only from bank option, it stays there. That makes all invoices for that vendor impossible to create. When clients transfer over from another firm, they often make bank accounts inactive as they create a new client with the same bank account and make the old one inactive to not interfere with entitlements.
When they make the bank account inactive, any existing recurring invoices will be generating invoices that cannot be deleted due to missing a payment. You also lose the ability to make the recurring inactive for the same reason so users must go into each vendor to change any pay only from bank options. Gelfand has experienced this issue for months and is very upset.