# Set Custom Ingredient Serving



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Replace a custom ingredient's serving / gram basis in one commit — every field is taken verbatim from the request (destructive replace, like `setRecipeIngredients`); an omitted field clears to null. `reference_quantity_g` is the derived as-sold gram basis the nutrition-calc adapter uses to convert stored nutrient amounts to a per-100g basis. Allowed while the ingredient is `draft` or `active`; rejected once `archived`.

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