fix(core-flows): allow backorder (#8721)

packages/core/core-flows/src/cart/utils/prepare-confirm-inventory-input.ts

@@ -90,6 +90,7 @@ export const prepareConfirmInventoryInput = (data: {
         allVariants.set(variants.id, {
           id: variants.id,
           manage_inventory: variants.manage_inventory,
+          allow_backorder: variants.allow_backorder,
         })
       }
     }

packages/core/core-flows/src/order/workflows/create-fulfillment.ts

@@ -225,6 +225,7 @@ export const createOrderFulfillmentWorkflow = createWorkflow(
         "currency_code",
         "items.*",
         "items.variant.manage_inventory",
+        "items.variant.allow_backorder",
         "shipping_address.*",
         "shipping_methods.shipping_option_id",
         "shipping_methods.data",

packages/core/core-flows/src/order/workflows/return/confirm-receive-return-request.ts

@@ -148,7 +148,6 @@ export const confirmReturnReceiveWorkflow = createWorkflow(
         "canceled_at",
         "items.*",
         "items.item.variant_id",
-        "items.item.variant.id",
         "items.item.variant.manage_inventory",
         "items.item.variant.inventory_items.inventory_item_id",
         "items.item.variant.inventory_items.required_quantity",

packages/medusa/src/api/utils/middlewares/products/variant-inventory-quantity.ts

@@ -24,6 +24,7 @@ export async function getVariantInventoryItems({
     fields: [
       "variant_id",
       "variant.manage_inventory",
+      "variant.allow_backorder",
       "required_quantity",
       "inventory.*",
       "inventory.location_levels.*",