In the opinion of the Ministry of Finance, a purchase can be made by indicating in the notice and documentation the price of a unit of work or services, as in the purchase of maintenance services for machinery or equipment.
The customer can use this option when it is impossible to calculate the amount of services in advance, as often happens. Based on the results of the purchase, the price of filling one cartridge will be determined, and the number of services will be limited by the price of the contract, which will be equal to the NMCC.
Similarly, you can purchase maintenance or repair services for cartridges.
Document:
Letter No. 24-02-07 / 79982 of the Ministry of Finance of the Russian Federation of 01.12.2017