diff --git a/brewman/brewman/routers/maintenance.py b/brewman/brewman/routers/maintenance.py
index 3d606275..cecb364e 100644
--- a/brewman/brewman/routers/maintenance.py
+++ b/brewman/brewman/routers/maintenance.py
@@ -30,7 +30,9 @@ def set_maintenance(
     user: UserToken = Security(get_user, scopes=["maintenance"]),
 ) -> Maintenance:
     with SessionFuture() as db:
-        maintenance: Optional[DbSetting] = db.execute(select(DbSetting).where(DbSetting.name == "Maintenance")).scalar_one_or_none()
+        maintenance: Optional[DbSetting] = db.execute(
+            select(DbSetting).where(DbSetting.name == "Maintenance")
+        ).scalar_one_or_none()
         if data.enabled is False and maintenance is not None:
             db.delete(maintenance)
             maintenance = None
diff --git a/brewman/brewman/routers/recipe.py b/brewman/brewman/routers/recipe.py
index ce1ae886..08b55430 100644
--- a/brewman/brewman/routers/recipe.py
+++ b/brewman/brewman/routers/recipe.py
@@ -99,8 +99,7 @@ def save(
                 r_item.recipe_id = recipe.id
                 db.add(r_item)
 
-            seen_recipes: Set[uuid.UUID] = set()
-            check_recursion(recipe, seen_recipes, db)
+            check_recursion(recipe_sku.product_id, recipe, db)
             db.commit()
             set_period(data.valid_from, data.valid_till, request.session)
             return recipe_info(recipe)
@@ -189,8 +188,8 @@ async def update_route(
                 recipe.items.append(RecipeItem(None, product.id, quantity, ingredient_cost))
 
             recipe.cost_price = round(recipe_cost / recipe.recipe_yield, 2)
-            seen_recipes: Set[uuid.UUID] = set()
-            check_recursion(recipe, seen_recipes, db)
+            sku.cost_price = round(recipe.cost_price / recipe.recipe_yield, 2)
+            check_recursion(sku.product_id, recipe, db)
             db.commit()
             set_period(data.valid_from, data.valid_till, request.session)
             return recipe_info(recipe)
@@ -201,13 +200,7 @@ async def update_route(
         )
 
 
-def check_recursion(recipe: Recipe, seen_recipes: Set[uuid.UUID], db: Session) -> None:
-    if recipe.sku.product_id in seen_recipes:
-        raise HTTPException(
-            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
-            detail="Recipe recursion. Some ingredient recipe contains parent recipe.",
-        )
-    seen_recipes.add(recipe.sku.product_id)
+def check_recursion(product_id: uuid.UUID, recipe: Recipe, db: Session) -> None:
     for item in recipe.items:
         item_recipes: List[Recipe] = (
             db.execute(
@@ -226,7 +219,12 @@ def check_recursion(recipe: Recipe, seen_recipes: Set[uuid.UUID], db: Session) -
             .all()
         )
         for sub_recipe in item_recipes:
-            check_recursion(sub_recipe, seen_recipes, db)
+            if sub_recipe.sku.product_id == product_id:
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="Recipe recursion. Some ingredient recipe contains parent recipe.",
+                )
+            check_recursion(product_id, sub_recipe, db)
 
 
 def get_purchased_product_cost(product: Product, start_date: date, finish_date: date, db: Session) -> Decimal:
@@ -272,7 +270,7 @@ def get_sub_product_cost(product: Product, start_date: date, finish_date: date,
             detail=f"Ingredient {product.name} is not bought and also does not have a recipe for the period.",
         )
 
-    return round(recipe.cost_price / recipe.sku.fraction / recipe.sku.product_yield, 5)
+    return round(recipe.cost_price / recipe.sku.fraction / recipe.sku.product_yield, 5)  # type: ignore[no-any-return]
 
 
 def update_old_rows(sku_id: uuid.UUID, valid_from: date, valid_till: date, db: Session) -> None: