How the accounting derived for AR Receipt (Event - Receipt Created and Class - Balance)

Summary:

Content (required):

We have an AR receipt and in the accounting, we see two lines Cr and Dr created as Event - Receipt Created and Class - Balance.

Analyze Journal entry shows "The selected line or distribution was system generated without using subledger journal entry rules"

Please let us know, From Where this accounting cc is getting derived from?

Version (include the version you are using, if applicable):

23B

Code Snippet (add any code snippets that support your topic, if applicable):