CHINA has warned that Taiwan's decision to bar a leader of a mainland basketball team from visiting might jeopardise sports contacts across the straits in the long-run. The Hongkong China News Agency yesterday criticised what it called the ''discriminating'' policy to disallow sports representatives who hold official positions in the party, government and the military. A 33-member joint basketball team from Liaoning and Hebei has been stranded in Hongkong because Taipei considered one of its leaders an official. The report said the whole team would cancel its trip if any of its members were denied entry. Meanwhile, China yesterday gave a cautious and mixed response to the confirmation of Taiwan Governor Mr Lien Chan as the first native-born premier of the island. Mr Lien was nominated by President Mr Lee Teng-hui, also a Taiwan native, to replace Mr Hau Pei-tsun. A spokesman from the State Council's Taiwan Affairs Office said: ''We have taken note of that, but it is inappropriate for us to make any comment on the internal affair of Taiwan.'' But a semi-official news agency was more critical over Mr Lien's recent remarks on the campaign for Taiwan to re-gain its United Nations seat. The China News Service, in a signed commentary, dismissed Taiwan's bid to seek admission as ''fruitless''.