Can I make journal entry changeable with information of Billing Event?

My customer bill multiple times for bills generated from a single Contract Line.

So, different journal entries need to be generated for Bill in advanced and Usual Billing .

Therefore, we tried to see if we could specify the event type in the source of the AR Account Rules, but this resulted in an error when saving.

Since the event type can hold a tax classification, would it be possible to specify the source as the tax classification passed from PPM to AR?

There is an entry in the AR source that looks like it.

If you have any ideas, please let me know.