Unable to delete posted General Billing invoices

Can not delete invoices

How to delete an invoice

• Munis
• General Billing
• Adjust Invoices

This can be a scenario where a user may be new to General Billing, not aware that GB Invoices can be deleted or the user may not have the permission to delete invoices. 

1. Navigate to System Administration>Security>Roles.
2. Site can decide to add the Delete Posted Invoices permission to an existing General Billing role or copy the role and add the Delete Posted Invoices permission to give a user a unique role with this functionality. 
3. The user(s) will now be able to Delete Posted Invoices from the Adjust Invoices program. 

Already have permissions to Delete General Billing Invoices but need to How to Delete a General Billing Invoice?