How do I resolve the transaction is completed but not disposed error

using (var scope = new TransactionScope())
{
 List<InvItemUom> itemUOM = this.getDb().Query<InvItemUom>("").ToList();
 dd.CompanyId = Convert.ToInt32(SessionData.GetSessionData(context, "CompanyId"));
 dd.UpdatedBy = SessionData.GetSessionUserId(context);
 dd.UpdatedOn = DateTime.Now;
 this.getDb().Update(dd);
 
foreach (var item in dd.ddDetails)
{
 item.DepDocumentId = dd.Id;
 this.getDb().Update(item);
}

if (dd.StatusId == (int)CommonEnum.Status.DepreciationDocument_Complete)
{
 foreach (var item in dd.ddDetails)
 {
  FaAccount faAccount = new FaAccount();
  FaDepreciation faDepreciation = new FaDepreciation()
  {
   AppreciateValue = 0,
   A_WDV = 0,
   Createdat = DateTime.Now,
   DepreciateValue = (double)item.DepreciationValue,
   FaAccountId = (int)item.FAAccountId,
   FinancialEndDate = (DateTime)dd.FinancialEndDate,
   FinancialStartDate = (DateTime)dd.FinancialStartDate,
   NetValue = (double)item.NetValue,
   OldValue = (double)item.ActualValue,
   Percentage = (double)item.Percentage,
   Period = (int)dd.Period,
   IsDeleted = 0,
   };
   getDb().Insert(faDepreciation);

//this calls the different repository and insert records in FaTransaction table.
faTransactionRepository.Transaction((int)item.FAAccountId,(DateTime)dd.FinancialEndDate,                            (int)CommonEnum.InvItemWarrantyDocumentType.FATransactionType.Depreciation, dd.Id, null, null, null, -(double)item.DepreciationValue, (int)dd.Period, 0, (int)dd.CompanyId, (int)(dd.UpdatedBy ?? dd.CreatedBy));

//this calls the different repository and update records in FaAccount table.
faAccount = faAccountRepository.getFaDetailById((int)item.FAAccountId);
faAccount.Amount = faDepreciation.NetValue;
faAccountRepository.updateRecord(faAccount);

int accountLocation = this.getDb().Query<int>("select LocationId from faaccount where isdeleted =0 and id = @0", item.FAAccountId).Single();

FAreg lastFaSummary = this.getDb().Query<FAreg>("select * from FAreg where CompanyId = @0 and CAST([YEAR] AS INT) = year(getdate()) - 1 and FaAccountId = @1", dd.CompanyId, item.FAAccountId).SingleOrDefault();

dynamic currentFaSummary = this.getDb().Query<dynamic>(@"select FaC.Name FixedAssets,FaT.FaAccountId, FaT.Period,ABS(SUM(case when FaT.Type = 1 then FaT.Amount else 0 end)) adp, ABS(SUM(CASE WHEN (FaT.Type = 3 or FaT.Type = 6) then FaT.Amount else 0 end)) cadp, ABS(SUM(case when FaT.Type = 5 then FaT.Amount else 0 end)) dcewop, ABS(SUM(case when (FaT.Type = 3 or FaT.Type = 6) and FaT.Period = @2 then 
dbo.GetCurrentDepreciation(FaT.FaAccountId,FaT.CompanyId,FaT.CreatedOn) / 
DATEDIFF(month, FaT.CreatedOn,  Convert(varchar, dbo.fnc_FiscalYear( GETDate(),37) +1 ) + '-'+ '7' +'-01')  else 0 end)) ddast, FaC.id categoryId, fac.DepreciationPercent dr
from FaCategory FaC join FaAccount fa on fa.CategoryId = FaC.id join FaTransaction FaT on FaT.FaAccountId=fa.id where FaT.Period = dbo.fnc_FiscalYear(GETDate(), @0) and FaT.CompanyId = @0 and FaT.FaAccountId = @1 group by FaC.Name,FaT.FaAccountId  ,FaT.Period, FaC.id, fac.DepreciationPercent", dd.CompanyId, item.FAAccountId, dd.Period).Single();

int gParentId = this.getDb().Query<int>(" with getallparent as (" +
select Id,ParentId, ROW_NUMBER() OVER ( PARTITION BY id ORDER BY id ) row_num" +
from FaCategory where Id = @0" +
union all " +
select C.Id,C.ParentID, row_num + 1 from FaCategory c inner join getallparent p on p.ParentId = c.Id" + 
" ) select top 1 Id from getallparent order by row_num desc", item.CategoryId).Single();

string Categoryinitials = CommonHelper.setLevel1Value(gParentId);

   FAreg fAreg = new FAreg()
   {
   YEAR = currentFaSummary.Period.ToString(),
   LEVEL1 = Categoryinitials,
   Location = accountLocation.ToString(),
   FAno = item.FAAccountId,
   SAno = 1,
   CFLB = lastFaSummary == null ? 0 : lastFaSummary.BC,
   ADP = currentFaSummary.adp,
   CADP = currentFaSummary.cadp,
   BC = (lastFaSummary == null ? 0 : lastFaSummary.BC) + currentFaSummary.adp,
   DR = currentFaSummary.dr,
   DEWOLY = lastFaSummary == null ? 0 : lastFaSummary.TDCEWO,
   DCEWOP = currentFaSummary.dcewop,
   DDAST = currentFaSummary.ddast,
   TDCEWO = (lastFaSummary == null ? 0 : lastFaSummary.TDCEWO) +  
   currentFaSummary.dcewop 
   - currentFaSummary.ddast,
   NBVEP =  (lastFaSummary == null ? 0 : lastFaSummary.BC) - (lastFaSummary ==       
   null ? 0 
   : lastFaSummary.TDCEWO) - currentFaSummary.dcewop,
   NBVEPY = (lastFaSummary == null ? 0 : lastFaSummary.NBVEP),
   CompanyId = dd.CompanyId,
   CategoryId = item.CategoryId,
   FaAccountId = item.FAAccountId,
   GparentId = gParentId
   };
fAreg.NBVEP = Math.Abs((double)fAreg.NBVEP);
getDb().Insert(fAreg);
  }
 }

scope.Complete();
}

//This is FaTransaction.Transaction method code to have a look into it. 
public void Transaction(int id, DateTime date, int type, int typeId, int? invoice, int? vendor, int? material, double amount, int period, int locationId, int company, int assign, string remarks = "", int indAmount=0)
        {
            var db = this.getDb();
            FaTransaction ft = new FaTransaction();
            ft.FaAccountId = id;
            SetTransactionNo(ft);
            ft.Date = date;
            ft.InvoiceId = invoice;
            ft.VendorId = vendor;
            ft.TypeId = typeId;
            ft.Type = type;
            ft.remarks = remarks;
            ft.MaterialId = material;
            ft.Amount = amount;
            ft.Period = period;
            ft.LocationId = locationId;
            ft.CompanyId = company;
            ft.AssignTo = assign;
            ft.CreatedOn = DateTime.Now;
            ft.CreatedBy = SessionData.GetSessionUserId(context);
            db.Insert(ft);
        }

<system.transactions>
 <machineSettings maxTimeout="00:30:00" />
</system.transactions>