How to get invoice accounting lines' class.

Summary: Writing a SQL report to get invoice line's class and we are unsure how to get that and what table(s) that data may need to be joined from in order to get it.

Content (required): We are trying to get the Class column from the screen shot below. You can get to this screen by going to an invoice, clicking validated in the upper right and then clicking accounted. Able to get accounting line data but can't determine where the class data comes from.

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

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