Question: When I try to send parameter with Russian letters to a report then passed as an empty string. Note - Russian letters recoded function Utf8Encode.
FR Server prior to version 2.2 supports only the transfer of Russian letters are encoded in Unicode. Starting with 2.2 supports Unicode encoding and system default encoding (windows-1251). If you have a server version below 2.2, then the reason of the problem is wrong encoding.