Copy quote to order

I'm trying to copy a quote to order using this code:

SAPbobsCOM.Documents cotizacion = (SAPbobsCOM.Documents)SesionActual.oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oQuotations);
                if (!cotizacion.GetByKey(docEntry))
                    return false;
                SAPbobsCOM.Documents pedido = (SAPbobsCOM.Documents)SesionActual.oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oOrders);
 
 
 
 
                pedido.Series = 6;
                pedido.CardCode = cotizacion.CardCode;
                pedido.DocDate = DateTime.Today;
                
                pedido.TaxDate = DateTime.Today;
 
 
 
 
 
 
                pedido.Confirmed = SAPbobsCOM.BoYesNoEnum.tYES;
                
                pedido.TransportationCode = cotizacion.TransportationCode;
                pedido.ShipToCode = cotizacion.ShipToCode;
                pedido.SalesPersonCode = cotizacion.SalesPersonCode;
                pedido.NumAtCard = cotizacion.NumAtCard;
                pedido.ContactPersonCode = cotizacion.ContactPersonCode;
 
 
               
 
 
                for (int i = 0; i < cotizacion.Lines.Count; i++)
                {
                    cotizacion.Lines.SetCurrentLine(i);
                    pedido.Lines.BaseEntry = cotizacion.DocEntry;
                    pedido.Lines.BaseLine = i;
                    pedido.Lines.BaseType = (int)SAPbobsCOM.BoObjectTypes.oQuotations;
                    
                   
 
 
                    pedido.Lines.Add();
                }
                pedido.DocDueDate = DateTime.Today;                
                int res = pedido.Add();
 
 
                if (res != 0)
                {
                    String msgError = "";
                    int msgClave = 0;
                    SesionActual.oCompany.GetLastError(out msgClave, out msgError);
                }

When I add the order I get this error :

Internal error (-2010) occurred

I don't have any idea about which could be the problem.