ExecuteNonQuery要求命令具有事务

当我尝试执行以下代码时，我收到了此错误消息。

ExecuteNonQuery requires the command to have a transaction when the connection assigned to the command is in a pending local transaction

有人能告诉我问题出在哪里吗？我想问题的根源是我试图执行存储过程的部分。

存储过程在执行时创建自己的事务

 using (SqlConnection conn = new SqlConnection(connStr))
            {
                conn.Open();
                SqlCommand command = conn.CreateCommand();
                SqlTransaction transaction;
                // Start a local transaction.
                transaction = conn.BeginTransaction("createOrder");
                // Must assign both transaction object and connection
                // to Command object for a pending local transaction
                command.Connection = conn;
                command.Transaction = transaction;
                try
                {
                    command.CommandText = "INSERT INTO rand_resupply_order (study_id, centre_id, date_created, created_by) " +
                        "VALUES (@study_id, @centre_id, @date_created, @created_by) SET @order_id = SCOPE_IDENTITY()";
                    command.Parameters.Add("@study_id", SqlDbType.Int).Value = study_id;
                    command.Parameters.Add("@centre_id", SqlDbType.Int).Value = centre_id;
                    command.Parameters.Add("@date_created", SqlDbType.DateTime).Value = DateTime.Now;
                    command.Parameters.Add("@created_by", SqlDbType.VarChar).Value = username;
                    SqlParameter order_id = new SqlParameter("@order_id", SqlDbType.Int);
                    //study_name.Value = 
                    order_id.Direction = ParameterDirection.Output;
                    command.Parameters.Add(order_id);
                    command.ExecuteNonQuery();
                    command.Parameters.Clear();
                    //loop resupply list 
                    for (int i = 0; i < resupplyList.Count(); i++)
                    {
                        try
                        {
                            SqlCommand cmd = new SqlCommand("CreateOrder", conn);
                            cmd.CommandType = CommandType.StoredProcedure;
                            cmd.Parameters.Add("@study_id", SqlDbType.Int).Value = study_id;
                            cmd.Parameters.Add("@centre_id", SqlDbType.Int).Value = centre_id;
                            cmd.Parameters.Add("@created_by", SqlDbType.VarChar).Value = username;
                            cmd.Parameters.Add("@quantity", SqlDbType.VarChar).Value = resupplyList[i].Quantity;
                            cmd.Parameters.Add("@centre_id", SqlDbType.Int).Value = centre_id;
                            cmd.Parameters.Add("@depot_id", SqlDbType.VarChar).Value = depot_id;
                            cmd.Parameters.Add("@treatment_code", SqlDbType.Int).Value = centre_id;
                            cmd.Parameters.Add("@order_id", SqlDbType.Int).Value = (int)order_id.Value;
                            cmd.ExecuteNonQuery();
                        }
                        catch (SqlException ex)
                        {
                            transaction.Rollback();
                            ExceptionUtility.LogException(ex, "error");
                            throw ex;
                        }
                        catch (Exception ex)
                        {
                            transaction.Rollback();
                            ExceptionUtility.LogException(ex, "error");
                            throw ex;
                        }
                        finally
                        {
                            conn.Close();
                            conn.Dispose();
                        }
                    }
                    return (int)order_id.Value;
                }
                catch (Exception ex)
                {
                    transaction.Rollback();
                    ExceptionUtility.LogException(ex, "error");
                    throw ex;
                }
                finally
                {
                    // Attempt to commit the transaction.
                    transaction.Commit();
                    conn.Close();
                    conn.Dispose();
                    command.Dispose();
                }

    cmd.Transaction = transaction;