GitHub user dosubot[bot] added a comment to the discussion: Question: Encountered "Failed to save slice" error when saving chart to dashboard
<!-- Answer --> Based on your role configuration, the Gamma role does include [`can write on Chart`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/RESOURCES/STANDARD_ROLES.md) by default, so that's not the issue. However, there are a few things to verify: **Most likely cause: Datasource access mismatch** Even with `can write on Chart`, Gamma users are [restricted to datasources they've been explicitly granted access to](https://github.com/apache/superset/issues/31938#issuecomment-2604121619). Make sure the **WAREHOUSE_RW** role includes `datasource_access` on the **exact dataset** the chart is using—not just the database or table, but the specific Superset dataset object. **Other permissions to check:** 1. **Chart ownership** – If the user is trying to overwrite someone else's chart, they won't have permission unless they're listed as an owner of that chart 2. **Dashboard ownership** – If adding to a dashboard, the user must be an owner of that dashboard 3. **`can read on Dataset`** and **`can read on Database`** – [These are sometimes needed alongside datasource_access](https://github.com/apache/superset/discussions/34353#discussioncomment-13911542) **Quick test:** Have the user try saving the chart as a **new chart** (not overwriting) without adding it to any dashboard. If that works, the issue is likely ownership-related. If it still fails, it's almost certainly a datasource access issue. Could you check the backend logs for the full error message? It usually specifies exactly which permission is missing. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=brand-link).* --- <sup>How did I do? 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