Billing Document missing in KE30

Hi Gurus, I have a question involving Account-Based COPA. The Reference Document (which is billing document) comes through fine in KE24 (COPA Line Items), but is not available when building a KE30 report. I thought of adding a KEDR COPA derivation, but it seems like if the billing document comes through to KE24, it is already coming, so that would not be a solution.

Does anyone have any ideas on how to get the KE30 report characteristics to include the Reference Document? The only reason we are wanting KE30 instead of KE24 is because in KE30 we can get some text fields that are not available in KE24 like sales office text.

Thanks in advance

David