The "Remaining Amount" - Outstanding balance of the amount invoiced for the Work Order - field is only available on job reports.
Please add this field, or something similar, to invoice reports. Currently, invoice reports can only show the full amount of the invoice. If an invoice is partially paid, the remaining balance due cannot be captured on a report.
Having the "Balance Due" field on an SB invoice report would allow for ease of comparison with QBO open invoice reports.