feat: add new error message for addition items validation

src/i18n/en.json

@@ -113,7 +113,8 @@
     "maximum": "Must be at most {maximum}",
     "time": "Wrong time format.",
     "wrong_format": "Wrong format.",
-    "add_on_required": "Select at least one add-on"
+    "add_on_required": "Select at least one add-on",
+    "additional_items": "Unable to save due to missing required additional info — click the ⚙ icon to review"
   },
   "price_tiers": {
     "early_bird_rate": "Early Bird Rate",

src/pages/sponsors/sponsor-page/tabs/sponsor-cart-tab/components/edit-form/__tests__/edit-cart-form.test.js

@@ -446,6 +446,60 @@ describe("EditCartForm", () => {
     });
   });
 
+  describe("Item Field Error Message", () => {
+    test("shows error message below Save when a required Item field is empty after submit", async () => {
+      const formWithRequiredItemField = {
+        ...mockCartForm,
+        items: [
+          {
+            ...mockCartForm.items[0],
+            meta_fields: [
+              {
+                type_id: 2,
+                type: "Text",
+                class_field: "Item",
+                current_value: "",
+                is_required: true
+              }
+            ]
+          }
+        ]
+      };
+
+      renderWithStore({}, { cartForm: formWithRequiredItemField });
+
+      await waitFor(() => {
+        expect(screen.getByText(/general.save/)).toBeInTheDocument();
+      });
+
+      await userEvent.click(screen.getByText(/general.save/));
+
+      await waitFor(() => {
+        expect(
+          screen.getByText("validation.additional_items")
+        ).toBeInTheDocument();
+      });
+    });
+
+    test("does not show error message when no Item fields have validation errors", async () => {
+      renderWithStore();
+
+      await waitFor(() => {
+        expect(screen.getByText(/general.save/)).toBeInTheDocument();
+      });
+
+      await userEvent.click(screen.getByText(/general.save/));
+
+      await waitFor(() => {
+        expect(mockUpdateCartForm).toHaveBeenCalled();
+      });
+
+      expect(
+        screen.queryByText("validation.additional_items")
+      ).not.toBeInTheDocument();
+    });
+  });
+
   describe("Edge Cases", () => {
     test("handles empty items array", async () => {
       const emptyForm = {

src/pages/sponsors/sponsor-page/tabs/sponsor-cart-tab/components/edit-form/index.js

@@ -277,6 +277,10 @@ const EditForm = ({
   // wait for formik to re-initialize with form items
   if (!form || Object.keys(formik.values).length === 0) return null;
 
+  const hasItemFieldErrors = Object.keys(formik.errors).some(
+    (key) => key.includes("-c-Item-") && formik.touched[key]
+  );
+
   return (
     <>
       <Typography variant="h5" sx={{ mt: 4, mb: 2 }}>
@@ -319,6 +323,18 @@ const EditForm = ({
               {T.translate("general.save")}
             </Button>
           </Box>
+          {hasItemFieldErrors && (
+            <Box component="div" sx={{ mt: 1 }}>
+              <Typography
+                variant="caption"
+                color="error"
+                display="block"
+                sx={{ mt: 0.25, textAlign: "right" }}
+              >
+                {T.translate("validation.additional_items")}
+              </Typography>
+            </Box>
+          )}
         </Box>
         <NotesModal
           item={notesItem}