EU talks with Beijing on minimum import prices to avert the bloc's tariffs on China-built electric vehicles pose a "formidable challenge" as cars are complex products and because offers must be adequate and enforceable, a senior EU official said. The tariffs are due to be imposed after the European Union's anti-subsidy investigation into EVs, which is scheduled to conclude at the end of this month. "I won't exclude it, but it seems very, very difficult to reach an agreement by the end of October, because (of)... the very complex, difficult issues to solve," the official said on Monday. Negotiations could extend beyond then, but the official said the challenge was daunting because price undertakings, involving a minimum price, had so far been for homogenous commodities, rather than complex products such as cars with many different sales channels. The European Commission has received minimum price offers from the Chinese Chamber of Commerce covering several EV producers and from a number of diverse individual exporters, the official said.