fix(dashboard, medusa): validate provider for top level tax regions (#12450)

* fix(dashboard, medusa): validate provider for top level tax regions

* chore: changesets, message

* chore: add test case for province

* fix: remove comment

packages/medusa/src/api/admin/tax-regions/validators.ts

@@ -3,6 +3,7 @@ import {
   createFindParams,
   createOperatorMap,
   createSelectParams,
+  WithAdditionalData,
 } from "../../utils/validators"
 import { applyAndAndOrOperators } from "../../utils/common-validators"
 
@@ -39,8 +40,8 @@ export const AdminGetTaxRegionsParams = createFindParams({
   .merge(AdminGetTaxRegionsParamsFields)
   .merge(applyAndAndOrOperators(AdminGetTaxRegionsParamsFields))
 
-export type AdminCreateTaxRegionType = z.infer<typeof AdminCreateTaxRegion>
-export const AdminCreateTaxRegion = z.object({
+export type AdminCreateTaxRegionType = z.infer<typeof CreateTaxRegion>
+export const CreateTaxRegion = z.object({
   country_code: z.string(),
   provider_id: z.string().nullish(),
   province_code: z.string().nullish(),
@@ -57,6 +58,16 @@ export const AdminCreateTaxRegion = z.object({
   metadata: z.record(z.unknown()).nullish(),
 })
 
+export const AdminCreateTaxRegion = WithAdditionalData(
+  CreateTaxRegion,
+  (schema) => {
+    return schema.refine((data) => data.parent_id || data.provider_id, {
+      path: ["provider_id"],
+      message: "Provider is required when creating a non-province tax region.",
+    })
+  }
+)
+
 export type AdminUpdateTaxRegionType = z.infer<typeof AdminUpdateTaxRegion>
 export const AdminUpdateTaxRegion = z.object({
   province_code: z.string().nullish(),