Event/Exit for Aggregate Invoicing

Hi All,

I am looking for ​an event/exit for aggregate invoicing process.The issue here is that we are currently aggregating based on supplier account(1 aggregate doc for multiple fica docs).

Now what we want here is that create 1 aggregate doc(BCBLN in DFKKTHI table) per individual invoice.

Other solution that is suggested is aggregate positive and negative invoices separately.

Let me know if any of the above mentioned solution is possible.I am looking for few events and found the following:

R208

R478

R 566

Thanks,

Shreeraj