Try this:
$('form :input').change(function() {
var DocumentID = $('#ctl00_m_g_a98b84c2_da23_4861_aba3_de78ad6ca2fb_ff16_1').val();
var DocumentType = $("option:selected", $("select[title='Document Type']")).text();
var Discipline = $("option:selected", $("select[title='Discipline']")).text();
var SeqNo = $("input[title='Sequence No']").val();
var PAWONo = $("input[title='PO / WO Number']").val();
$("input[title='Document No']").val("MP0041" + '-' + PAWONo + '-' + Discipline + '-' + DocumentType + '-' + SeqNo);
$().SPServices({
operation: "GetListItems",
async: false,
listName: "Vendor Register",
CAMLViewFields: "<ViewFields><FieldRef Name='DocumentNo' /><FieldRef Name='View_x0020_Item' /></ViewFields>",
CAMLRowLimit: 5,
CAMLQuery: "<Query><Where><And><Eq><FieldRef Name='Discipline'/><Value Type='Text'>" + Discipline + "</Value></Eq><Eq><FieldRef Name='DocumentType'/><Value Type='Text'>" + DocumentType + "</Value></Eq></And></Where><OrderBy><FieldRef Name='Created' Ascending='FALSE' /></OrderBy></Query>",
completefunc: function (xData, Status) {
var liHtml = "";
$(xData.responseXML).SPFilterNode("z:row").each(function() {
var DocNo = ($(this).attr("ows_DocumentNo"));
var href = ($(this).attr("ows_View_x0020_Item")).split(",")[0];
liHtml += "<li><a href='"+ href +"' target='_blank'>" + DocNo + "</a></li>";
});
$("#Querycontent").empty().append(liHtml);
}
});
});
/Paul