We do not use the certificates module but would like to be able to filter current seated members who have Open Meeting Certificates (OMA).
What you can do is create a custom label called OMA as part of the member's profile under Settings -> Configure Board Member Fields -> Training. You can make this visible or not visible on the public side.
This will then create a checkbox under the their profile.
Then when you run a board member report you can choose OMA as a filter and if the Training box is checked off or not.
This will now show you OMA in the report.