notify the user if any order cannot be invoiced on bulk invoice sending

app/reflexes/admin/orders_reflex.rb

@@ -93,15 +93,15 @@ def resend_confirmation_emails(params)
     end
 
     def send_invoices(params)
-      count = 0
-      editable_orders.invoiceable.where(id: params[:bulk_ids]).find_each do |o|
-        next unless o.distributor.can_invoice?
+      orders = editable_orders.invoiceable.where(id: params[:bulk_ids])
 
+      return if any_order_cannot_be_invoiced(orders)
+
+      orders.each do |o|
         Spree::OrderMailer.invoice_email(o.id, current_user_id: current_user.id).deliver_later
-        count += 1
       end
 
-      success("admin.send_invoice_feedback", count)
+      success("admin.send_invoice_feedback", orders.size)
     end
 
     private
@@ -133,5 +133,21 @@ def render_business_number_required_error(distributors)
                              enterprise_name: distributor_names.join(", "))
       morph_admin_flashes
     end
+
+    def any_order_cannot_be_invoiced(orders)
+      distributors = distributors_who_cannot_invoice(orders)
+      return false if distributors.empty?
+
+      distributor_names = distributors.map(&:name).join(",")
+      flash[:error] = I18n.t(:must_have_valid_business_number, enterprise_name: distributor_names)
+      true
+    end
+
+    def distributors_who_cannot_invoice(orders)
+      orders.map do |order|
+        order.distributor
+      end.reject(&:can_invoice?)
+        .uniq
+    end
   end
 end