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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.

...

You are likely to decipher the "ScannedValue".

    // Step 3    

    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Whse. Inquiry", 'OnWhseInquiryOnCustomDocumentType', '', true, true)]
    localprocedure OnWhseInquiryOnCustomDocumentType(_DocumentType: 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', 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;