Furor over a flawed labor ministry probe into the government-proposed discretionary labor system intensified Thursday after it was revealed that the survey contained at least 117 errors.

This latest development further erodes the credibility of data underpinning Prime Minister Shinzo Abe's campaign to reform Japan's work style.

Opposition lawmakers ratcheted up condemnation of the evolving data scandal, with Seiji Osaka of the Constitutional Democratic Party saying labor minister Katsunobu Kato should resign if any further shortcomings in the 2013 survey are discovered.