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    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Setup Doc. Types", 'OnAfterCreateDefaultDocumentTypes', '', true, true)]
    local procedure OnAfterCreateDefaultDocumentTypes()
    var
        MobWmsSetupDocTypes: Codeunit "MOB WMS Setup Doc. Types";
    begin
        MobWmsSetupDocTypes.CreateDocumentType('GetLineSelectionInformation', '', Codeunit::"MOB WMS Whse. Inquiry");

    end;

Remember to run Create Document Types from Mobile WMS Setup. Otherwise you will get this error.

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Step 3 - Respond with Item No.

Respond to the "GetLineSelectionInformation" request and return an Item no.

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You are likely to decipher the "ScannedValue".

    // Step 3

    [EventSubscriber(ObjectType::Codeunit,  Codeunit::"MOB WMS WhseMOB WMS Whse.  InquiryInquiry",  'OnWhseInquiryOnCustomDocumentTypeAsXmlOnWhseInquiryOnCustomDocumentType',  '',  truetrue,  truetrue)]
        localprocedure MyOnWhseInquiryOnCustomDocumentTypeAsXml OnWhseInquiryOnCustomDocumentType(_DocumentType:  Text; var _XMLRequestDoc: XmlDocument; var _XMLResponseDoc: XmlDocument; var _IsHandled: Boolean)
    var
        RequestValues: Record "MOB NS Request Element" temporary;
        MobToolbox: Codeunit "MOB Toolbox";
        MobXMLMgt: Codeunit "MOB XML Management";
        RequestMgt: Codeunit "MOB NS Request Management";
        XMLResponseData: XmlNode;
        SerialNumberInformationNode: XmlNode;
        ScannedValue: Text;
    begin
        // Handle only "GetLineSelectionInformation"
        if not (_DocumentType.Contains('GetLineSelectionInformation')) or _IsHandled then
            exit;
        // Save the incoming request values
        RequestMgt.SaveAdhocFilters(_XMLRequestDoc, RequestValues);
        // Get the request value of "SerialNumber" - we mapped the incoming barcode to this field
        ScannedValue := Text; var _RequestValues: Record "MOB NS Request Element"; var _ResponseElement: Record "MOB NS Resp Element"; var _RegistrationTypeTracking: Text; var _IsHandled: Boolean)
    var
        SerialNumber: Code[50];
    begin
        if _IsHandled then
            exit;

        if _DocumentType = 'GetLineSelectionInformation' then begin            
            SerialNumber := _RequestValues.GetValue('SerialNumber');
        // Do you logic for Searching for the item
        // Initialize the response document for order data
        MobToolbox.InitializeResponseDoc(_XMLResponseDoc, XMLResponseData);
        MobXMLMgt.AddElement(XMLResponseData, 'SerialNumberInformation', '', MobXMLMgt.NS_WHSEMODEL(), SerialNumberInformationNode);
        // Respond with the Item, that the Scanned barcode represents
        MobXMLMgt.AddElement(SerialNumberInformationNode, 'ItemNumber', GetItemFromBarcode(ScannedValue), MobXMLMgt.NS_WHSEMODEL(), SerialNumberInformationNode);
        _IsHandled := true;
    , true);
            _ResponseElement.Set_SerialNumberInformation(GetItemFromBarcode(SerialNumber));
            _IsHandled := true;
        end;
    end;

    procedure GetItemFromBarcode(ScannedValue: Text): Code[20]
    var
        Item: Record Item;
    begin
        // Please make your own logic to identify the Item from a barcode
        Item.SetRange("Description 2", ScannedValue);
        if Item.FindFirst() then
            exit(Item."No.");
    end;