These guys from ETS are true robbers. There is no info about sending both general and subject test. What confused me was a request to indicate your ID for an exam - and IDs for general and subject test are different. I called an ETS representative in American Councils St. Petersburg, Russia and he told me to send G and S request separatly and pay for both. And I did so.
Now, I was surprised, that ETS charged me only 120$ instead of 240$ and I thought that they fixed my misunderstanding. Oh, how stupid I was! They sent me an e-mail telling that my bank rejected two payments and I have to pay 120$ + a fine of 20$. My bank representative says that there were no rejects at all and ETS has an open access to my card, so anyway those rejects were not my fault.