In Xero you can confirm an "Account Code" (e.g. ABAP01) to represent a customer/supplier however you cannot see that in the CRM when viewing a sales ledger.
https://www.useloom.com/share/4b6707db44dd4300920e11957fd8101d
Our Xero integration works differently to the older onpremise accounts systems because it's "Accounts Code" is optional, and there for compatibility with older systems.
We could add an option to the Xero Integration to decide whether to display codes or descriptions, however Xero's integration recommendations are to display names only.