Custom report added to ship confirm document job set is generating all shipment records

Summary:

Created a custom proforma invoice report copied from the commercial invoice standard report data model and added to the ship confirm document job set. Upon ship confirm, the job set is triggered printing all reports assigned - packing slip report, commercial invoice report, BOL report and the custom proforma invoice report. However, the custom proforma invoice report is not only generating the report for the specific shipment but for all shipments which is not the expected behavior. Is there a way to set the same behavior as the other reports?

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