(VOANews) - Australia has filed a formal complaint with the World Trade Organization that accuses Canada of placing "discriminatory" rules on the sales of imported wine.

Canada is Australia's fourth-biggest wine market. Officials in Canberra say rules in Canada unfairly discriminate against overseas wine.

An official protest has been lodged with the World Trade Organization (WTO) against regulations in the Canadian province of British Columbia, where wine produced locally can be sold in grocery stores but imports must be sold in a "store within a store" with a separate cash register.