Hull have failed in a bid to secure compensation for teenager Luke Briscoe after he joined Leeds on a four-year contract last September.
A Rugby Football League operational rules tribunal ruled Hull relinquished their entitlement to compensation because the terms of the new deal they had offered Briscoe were less favourable than his previous contract.
Leeds chief executive Gary Hetherington said: "I am naturally pleased with this outcome."
Hull owner Adam Pearson criticised the ruling and took the opportunity, in a statement posted on his club's website, to re-iterate his call for changes in the government of the game.
He said: "The result of this morning's RFL tribunal has obviously not come as a surprise to us at Hull FC as we fully expected this predictable outcome despite Luke being presented with three formal contract offers.
"The whole tribunal process taking six months has been a complete sham and fiasco from start to finish and I had no confidence whatsoever that this would be a fair or equitable outcome.
"After the debacle of the Super League naming rights sponsorship process and other poorly-handled situations over the last 12 months, this only serves as further confirmation that there needs to be a complete root and branch overhaul of the entire governing body and its hugely expensive and ineffectual infrastructure."
