Multiple Tax Lines for Oracle AP Invoice for Outside sources

We have AP invoices interfaced through multiple outside systems. Some of these invoices have multiple tax distribution lines. 

I need to identify by each source whether or not a invoice has multiple tax lines for an invoices. If it does, then which invoices has it. I need to identify these by the source systems.

Can anyone help me do this research?

If you can think of a sql query that might help, please also let me know.

Thanks.