Cluster Codes visable as Item Codes on Invoices

When raising a manual invoice from the finance section of an enrolment, there is the option to "Select Clusters by clusters costs" which is great and helps out with block invoices. However, the item code that displays on the invoice is always the qualification, which makes it difficult to track in finance terms (even if exporting to Xero) 

I want to be able to know which clusters a student hasn't yet paid for and it's easiest if each cluster has it's own item code.

Clusters are already given unique codes (like quals, units and workshops) so its information that is already in the system.

Can it be created that if the above option (or any option to do with Clusters) is set up, that the item code pulled through is the cluster code.