fix(core-flows): Add discountable properties in queried fields to avoid overriding discountable properties when set (medusajs#14105)

* Add discountable properties to avoid applying adjustments to non discountable line items

* Add changeset

Author: NicolasGorga

.changeset/rare-symbols-stare.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/core-flows": patch
+---
+
+fix(core-flows): Add discountable properties in queried fields to avoid overriding discountable properties when set

packages/core/core-flows/src/order/utils/fields.ts

@@ -4,6 +4,7 @@ export const productVariantsFields = [
   "sku",
   "manage_inventory",
   "allow_backorder",
+  "is_discountable",
   "barcode",
   "product.id",
   "product.title",
@@ -15,6 +16,7 @@ export const productVariantsFields = [
   "product.type.id",
   "product.collection.title",
   "product.handle",
+  "product.discountable",
   "inventory_items.inventory_item_id",
   "inventory_items.required_quantity",
   "inventory_items.inventory.requires_shipping",