Customizable reports

We are looking for a way to include more detail on our G/L by Business Unit reports (R09420).  We would like to see the Invoice # or Purchase Order # for PV transactions on this report.  Can we customize this report, or is there a way to build a custom report that would include this information?  We can see this information in Account Ledger Inquiry (P09200) but want to see the information for an entire business unit at a time, rather than one specific account number at a time.  Thank you!