How can I add a new node to the XML document? I have tried this: xmlDocument.createElement({tagName: 'tranSales:orderLine'});

you need to share more about what you are trying and what error you are getting

This is the XML: <record xsi:type="tranSales:ItemFulfillment" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tranSales="urn:sales_2019_1.transactions.webservices.netsuite.com" xmlns:platformCore="urn:core_2019_1.platform.webservices.netsuite.com" xmlns:platformCommon="urn:common_2019_1.platform.webservices.netsuite.com"> <tranSales:createdFrom internalId="-1"> <platformCorename&gt;SO36161&lt;/platformCorename> </tranSales:createdFrom> <tranSalesshippedDate&gt;2022 05 13T100000Z&lt;/tranSalesshippedDate> <tranSalesshipStatus&gt; shipped&lt;/tranSalesshipStatus> <tranSales:itemList> <tranSales:item> <tranSalesitemReceive&gt;true&lt;/tranSalesitemReceive> <tranSalesquantity&gt;10.0&lt;/tranSalesquantity> <tranSales:inventoryDetail> <platformCommon:inventoryAssignmentList> <platformCommon:inventoryAssignment> <platformCommon:issueInventoryNumber internalId="33096"> </platformCommon:issueInventoryNumber> <platformCommonquantity&gt;10.0&lt;/platformCommonquantity> </platformCommon:inventoryAssignment> </platformCommon:inventoryAssignmentList> </tranSales:inventoryDetail> <tranSales:serialNumbers>136713/10/2021(10.0)</tranSales:serialNumbers> <tranSales:item internalId="1367"> </tranSales:item> <tranSalesorderLine&gt;1&lt;/tranSalesorderLine> <tranSales:customFieldList> <platformCore:customField xsi:type="platformCore:StringCustomFieldRef" scriptId="custcol_sps_lotnumbers"> <platformCore:value>136713/10/2021(10.0)</platformCore:value> </platformCore:customField> <platformCore:customField xsi:type="platformCore:StringCustomFieldRef" scriptId="custcol_sps_actualqty"> <platformCorevalue&gt;10.0&lt;/platformCorevalue> </platformCore:customField> </tranSales:customFieldList> </tranSales:item> </tranSales:itemList> <tranSales:customFieldList> <platformCore:customField xsi:type="platformCore:StringCustomFieldRef" scriptId="custbody_sps_carrierpronumber"> <platformCorevalue&gt;SO36161&lt;/platformCorevalue> </platformCore:customField> </tranSales:customFieldList> </record> I want to add transales:orderLine attribute to the tranSales:itemList I have tried this so far:

var newPriceNode = xmlDocument.createElement("tranSales:orderLine");
var newPriceNodeValue = xmlDocument.createTextNode(lineNumber);
newPriceNode.appendChild(newPriceNodeValue);
itemElements[i].appendChild(newPriceNode);

But it throws an unexpected error.

still not enough

there is orderline for this XML, but there are other similar xml which don't have this

Use Document.createElementNS when there are namespaces involved

tranSales is the namespace?

N/xml is different client side and serverside

@battk I revised the code to this:

var newOrderLineNode = xmlDocument.createElementNS({
   namespaceURI: 'urn:<http://sales_2019_1.transactions.webservices.netsuite.com|sales_2019_1.transactions.webservices.netsuite.com>',
   qualifiedName: 'tranSales:orderLine'
});
var newOrderLineNodeValue = xmlDocument.createTextNode(lineNumber);
newOrderLineNode.appendChild(newOrderLineNodeValue);
itemElements[i].appendChild(newOrderLineNode);

Now I am getting the error: "message":"HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is not permitted."