How to add grouping characteristic in autoinvoice grouping rule?

Summary: is it possible to add field orig_sys_bill_party_id in grouping characteristic autoinvoice grouping rule?

Content (required): My client using subscription management module, there is a requirement to create several subscription management into one invoice, group by customer. is it possible to add field orig_sys_bill_party_id in grouping characteristic autoinvoice grouping rule?

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