As a legal malpractice suit against Buchanan Ingersoll & Rooney works its way through a Pittsburgh court, a judge has ruled that additional defendant Proskauer Rose did enough business in Pennsylvania to withstand questions of general jurisdiction.

In so ruling, the judge determined the firm’s work for Pennsylvania clients, ranging from 1.12 percent to 1.88 percent of annual revenues in the relevant time period, was enough to constitute “systematic and continuous” business in the state.