Из-за канцелярской ошибки грузовые документы на товар, отправленный на п/х «Обь», не были приложены к вашему письму от 15 мая. Они были высланы Вам в тот же день отдельным пакетом.
Due to a clerical error shipping documents for goods sent to p/x "Ob", were not annexed to your letter dated 15 May. They were sent to you on the same day, a separate package.
Due to a clerical error shipping documents for the goods sent to the p / v "Ob" were not attached to your letter of 15 May. They were sent to you on the same day a separate package.
because of a clerical error, cargo documents for the goods sent to p / x "обь», were annexed to your letter of 15 may. they were sent to you on the same day, the individual package.