Thanks for the post. You can use a report called Payment Receipt (Detailed). This will provide a breakdown of what is being paid for. Click here to download.
To import this into ClinicOffice please see the topic How do I install a downloaded Report/Template?. This provides you with step by step instructions.
You might also find this alternative invoice helpful as well which can downloaded from here. This will display if an invoice has been paid and if not how much is outstanding.
Hope this helps.