It was hardcoded. And inside the Expand method, Arthur found the definition of SSIS-685. It wasn't a standard Microsoft error code. It was a custom exception thrown by the script itself.
He looked closer at the rejected row. OrderID: 89921 | Date: 2021-05-12 | Item: C45-Steel-Billet | Destination: Null SSIS-685
The result returned instantly.
Japanese (Standard); English subtitles are rarely official and usually limited to specific international versions It was hardcoded