Ssis-957 -

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| Symptom | Typical Message | Where you’ll see it | |---------|----------------|----------------------| | Package fails on the first row that reaches a data‑flow component using an expression with N'…' | Error: 0xC0202009 at Data Flow Task, Derived Column [123]: The data type of a column cannot be null. | SSIS Designer (Execution Results), console, Azure Data Factory monitor | | The same package runs fine on SQL 2019/2021 or after removing the N prefix | No error (or the same expression works with ‘…’ non‑Unicode) | — | | The error occurs even when the Unicode literal is not part of a variable (e.g., @[User::Country] == N'US' ) | Same as above | — | | The failure is reproducible on both on‑prem SSIS Catalog ( /SSISDB ) and Azure‑SSIS IR | Same error code and text | — | ssis-957