2 buttons in view. the one is inquiry info. and another is to submit data

I have found the question that  inquiry button use Jquery does not work(nothing happen when click it) when I click submit button to validate textbox firstly. 

but it is works when first click inquiry button.

Please give me help.  Thanks

Jquery code:

  $('#mvcContainer-@Dnn.ActiveModule.ModuleID .btn-rmasearch').click(function () {

        dnnModal.show('@Url.Action("Search", "Rma")?popUp=true&CustId=' + cid + "&SerialNumber=" + sn + "&KeyN=" + id, false, 350, 750, false);

    });

action code:

//inquiry

  public ActionResult Search(SearchCriteria criteria)

        {

            if (criteria.CustId == 0 || string.IsNullOrWhiteSpace(criteria.SerialNumber))

                return Content("Nothing have been request.");

            var invoices = InvoiceService.GetInvoices(criteria);

            invoices.KeyN = Request.QueryString["KeyN"];

            if (invoices.Count == 0)

                return Content("Nothing have been found");

            return View("RequestSearch", invoices);

        }

//submit

 [HttpPost]

        [ActionName("Request")]

        [DotNetNuke.Web.Mvc.Framework.ActionFilters.ValidateAntiForgeryToken]

        public ActionResult RmaRequest(RmaSetting RmaRequest)

        {  if (ModelState.IsValid)

                {

                    string newRefID = RmaService.PostRMA(RmaRequest, Request.QueryString["code"]);                    

                    if (!string.IsNullOrEmpty(newRefID))

                    {

                        RmaRequest.RefID = newRefID;

                        return View("RequestProcessItems", RmaRequest);

                    }

                }

                else

                {

                    ViewData["dropDownListRequest"] = ShowDDL1();

                    ViewData["dropDownListProblem"] = ShowDDL2();

                    ViewData["dropDownListStates"] = ShowDDL3(Country);

                    return View("Request",RmaRequest);

                }

}