DI API Problem when generating documents with Item with BOM "Template"

Question

I have a web application we've been using for years, we created an interface to select with child items from the BOM template you want to add, just like in SAP when you add this items in the document lines.
For some reason through the DI it automatically adds again this items additionally to the ones I selected, is there a way to change this behaviour?
I checked the Document.Lines.Count property when I add the item and after I add it in SAP and I get the total items that I put in the first place, but in the final document in SAP its completly different

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using SAPbobsCOM;
namespace SAP_Error_Demo
    class Test
        public static void Execute()
            try
                Company company = new Company
                                          DbServerType = BoDataServerTypes.dst_MSSQL2005,
                                          Server = ".",
                                          UseTrusted = true,
                                          CompanyDB = "ESHOPS",
                                          UserName = "manager",
                                          Password = "manager"
                int returnValue = company.Connect();
                int errCode;
                string errMsg;
                if (!returnValue.Equals(0))
                    company.GetLastError(out errCode, out errMsg);
                    MessageBox.Show(string.Format("Connection Error: {0}", errMsg));
                    return;
                Documents document = (Documents) company.GetBusinessObject(BoObjectTypes.oOrders);
                document.CardCode = "yuval";
                document.Series = 2;
                document.DocDate = DateTime.Now;
                document.DocDueDate = DateTime.Now.AddMonths(1);
                document.DocCurrency = "$";
                Document_Lines lines = document.Lines;
                lines.ItemCode = "21725";
                lines.Quantity = 1;
                lines.UnitPrice = 54.021;
                lines.Price = 54.021;
                lines.VatGroup = "V1";
                returnValue = document.Add();
                if (!returnValue.Equals(0))
                    company.GetLastError(out errCode, out errMsg);
                    MessageBox.Show(string.Format("An error ocurred when adding document: {0}", errMsg));
                    return;
                MessageBox.Show("Document was generated successfully");
                company.Disconnect();
            catch (Exception ex)
                MessageBox.Show(string.Format("Error: {0}", ex.Message));