This requirement, including requesting information about beneficiaries, violates Law № 223. It doesn’t affect the performance of contractual obligations and does not confirm their proper implementation.
Similar opinion antimonopoly service "expressed" and earlier.
If the procurement clause allows to establish this requirement, it’s recommended that customers modify the document. If there is such a requirement in the documentation, the antimonopoly authority has the right to issue an order to change it.
Document: Decision of the Federal Antimonopoly Service of Russia of 04.07.2017 N 223FZ-617/17