Within Mirth, right click the message you wish to have resent. Chose the option to reprocess message.
If you need to resend a message that has already been processed by OpenVista, you must change the MSH-10 message control ID before sending or OpenVista will see it as a duplicate and not process it.
Copy the message you would like to send (Ctrl-c or right click copy). Right click the connector you want to resend to such as ToVistaADT. Paste the message in and change the MSH-10 value. Here the value has be prefaced with 9999 to make it unique.
Click process message to send it.