A rare debate in the Supreme Soviet postponed voting on a law that would give more freedom to cooperative businesses. Delegates were seeking changes in provisions regarding tax policy and bureaucratic restrictions.

The Soviet Union's nominal parliament, which normally approves the Communist Party agenda with a unanimous show of hands and without debate, votes on the bill Thursday.The law, considered to be a key element of Mikhail S. Gorbachev's economic reform effort, would set tax rates for cooperatives while ensuring that their property may not be seized.

The law was to have been brought before a joint meeting of the Supreme Soviet on Wednesday. But 22 parliamentarians spoke about the law in meetings of the separate chambers Wednesday morning and the vote was delayed while a commission looked at a series of amendments, officials said.