Depending upon how your MIDAS room scheduling system has been configured, you may be unable to delete certain invoices.
This behavior is determined by the "Prevent Invoice Deletion" setting, which may be found within the software via MIDAS Admin Options → Manage MIDAS → Invoicing.
If this particular setting is set to "Always", then no invoices can be removed from the system. In order to remove an unwanted invoice from the system, you will first need to change this setting.
If this setting is set to "After sending, until paid in full", then an invoice can only before removed if either it's not yet been sent to the client, or if it's been paid in full. If it's been sent (i.e. printed or emailed to the client) but yet been paid in full, you will not be able to remove it.
In order to remove an invoice that falls into this category, you would need to first either update the invoice's status to denote that it has been paid in full, or change the "Prevent Invoice Deletion" setting to "Never".
