New documents were filed in the Brit conservatorship hearing last Thursday -- and now we know why the conservators want to give Brit's business manager the ax.

Lawyers for the conservators accused business manager Howard Grossman of ignoring their ground rules. One lawyer wrote in a declaration that she told Grossman "he was not permitted to give Britney any money, credit cards, or access to money or credit cards or to meet with Britney ... at the Beverly Hills Hotel or anywhere else."

The lawyer claims Grossman defied the order by meeting Brit at the Bev Hills Hotel last week. The lawyer, Jeryll Cohen, is pissed off because Grossman also directed Bev Hills Mercedes to deliver one of Britney's cars to the hotel without first getting the conservators' permission. Cohen says Grossman's lame excuse was that "he wanted to build her [Brit's] confidence in him."