Provide Link to New Record on Predecessor Record

If you just want to include an embedded report of the Predecessor record on the current record, create a Report Link field type Field and configure the left side as the [Record ID#] of the Predecessor, and the right side, navigate to the same app and same table and locate the [Record ID# field]. (watch out for a pop up blocker and accept the pop up). Put the report link field on the legacy form or on new forms put a report of all records and filter it by the Report link field in the side panel.