If an admin for a group sees this message when they try to pay for their group, the main cause of this would be that there is a refund owing to one of the attendees in that group. 

For a Group Registration:

1. Click Dashboard
   
2. Click the Attendee module
   
3. Click Manage Groups in the left-side menu
   
4. Locate the Group and click on the row to open the invoice
   
5. On the far right side of the screen, click Manage Group Members
   
6. You will see a list of the registrations, locate the one that indicates 'Status: Refund Owing', click Edit Registration and process a refund.

For an Exhibitor Registration:

1. Click Dashboard
   
2. Click the Exhibitor module
   
3. Click the Manage button
   
4. Locate the company invoice and click on the row to open the invoice
   
5. Click Registration in the horizontal menu and select Manage Staff
   
6. On the screen, you will see all staff registrations and which one is Incomplete amd a Refund is Owing.
   
7. Click Manage for the staff invoice that has a refund owing and process the refund.