Such line item of specialists of department is based on item 5 of the p. 2 of Art. 51 of the Law N 44-FL according to which the application for participation in an open tender shall contain the documents confirming introduction of providing this request, namely the payment order confirming money transfer as tender security, either the copy of this payment order or the bank guarantee conforming to requirements of Art. 45 of the Law N 44-FL.
At the same time representatives of the Ministry of Economic Development of the Russian Federation specify that the copy of the payment order can be created by means of the client bank with a mark about payment execution.
Document: Letter of the Ministry of Economic Development of the Russian Federation of 19.08.2016 N D28i-2165