anchor.diff:  
   maybe_aggregate_invoice(AccountId, Year, Month, Carriers) ->
       AccountOnbillDoc = onbill_util:account_doc(AccountId),
  -    case kz_json:get_value(<<"agregate_invoice">>, AccountOnbillDoc) of
  +    case kz_json:get_value(<<"aggregate_invoice">>, AccountOnbillDoc) of
           'true' -> aggregate_invoice(AccountId, Year, Month, Carriers);
           _ -> 'ok'
       end.
  
positive.code:                                                       ,{0,0,0}
                                                        ,VatUpdatedFeesList
                                                       ),
      [TotalBruttoDiv, TotalBruttoRem] = binary:split(float_to_binary(TotalBrutto,[{decimals,2}]), <<".">>),
      [TotalVatDiv, TotalVatRem] = binary:split(float_to_binary(TotalVAT,[{decimals,2}]), <<".">>),
      Vars = [{<<"monthly_fees">>, VatUpdatedFeesList}
             ,{<<"account_addr">>, address_to_line(AccountOnbillDoc)}
             ,{<<"total_netto">>, onbill_util:price_round(TotalNetto)}
  
negative.code: 
  generate_docs(AccountId, Year, Month, Carrier) ->
      CarrierDoc = onbill_util:carrier_doc(Carrier),
      OnbillGlobalVars = onbill_util:global_vars(),
      VatUpdatedFeesList = fees:shape_fees(AccountId, Year, Month, CarrierDoc, OnbillGlobalVars),
      Totals = lists:foldl(fun(X, {TN_Acc, VAT_Acc, TB_Acc}) ->
                                                          {TN_Acc + props:get_value(<<"cost_netto">>, X)
                                                           ,VAT_Acc + props:get_value(<<"vat_line_total">>, X)
                                                           ,TB_Acc + props:get_value(<<"cost_brutto">>, X)
  