Workflow for MIR7

Hi,

our business process requires some of the inoices to go through a senior managers approval before they get posted using MIRO. So is there a workflow that can be triggered as soon as the Payables park the invoice document in MIR7 , which will send an email notification to the senior manager and so that he can approve and post the invoice using MIRO ? If there is a workflow can i have some more information regarding the workflow?