checking for existing invoices.

src/cljs/auto_ap/views/pages/unpaid_invoices.cljs

@@ -279,7 +279,8 @@
                                                   [:expense_accounts [:amount :id :expense_account_id
                                                                       :location
                                                                       [:expense_account [:id :name [:parent [:id :name]]]]]]]]}]}  
-       :on-success [::invoice-edited]}})))
+       :on-success [::invoice-edited]
+       :on-error [::invoice-edit-failed]}})))
 
 
 (re-frame/reg-event-fx
@@ -361,6 +362,12 @@
                                   i)) is)))
             (dissoc ::edit-invoice))}))
 
+
+(re-frame/reg-event-fx
+ ::invoice-edit-failed
+ (fn [{:keys [db]} [_ data]]
+   {:dispatch [::events/modal-failed ::edit-invoice "That invoice already exists."]}))
+
 (re-frame/reg-event-fx
  ::invoice-voided
  (fn [{:keys [db]} [_ {:keys [void-invoice]}]]