How to verify the origin or mapping logic AR accounts in the backend.

Summary:

We have identified an issue where adjustments and write-offs in Accounts Receivable transactions are being posted to incorrect accounts once transferred to the GL. Additionally, the Rebate account is mapping to an incorrect revenue account during the accounting process.

All configurations in the application UI have been thoroughly reviewed and appear to be correctly set up. However, we would like to understand the source from which these accounts are being derived for the respective LOB's.

How to verify the origin or mapping logic of these accounts in the backend? Any guidance or documentation on the underlying account derivation process would be greatly appreciated.