Solidarity has proposed a second meeting between Lech Walesa and the interior minister to clear obstacles to planned negotiations on the banned labor federation's future, an intermediary's spokesman said Monday.

Jacek Moskwa, spokesman for go-between Andrzej Stelmachowski, did not disclose a date for the preliminary meeting. However, a union source who insisted on anonymity said the preliminary meeting is proposed for Wednesday, and the full-scale negotiations are to begin Thursday.A weekend Solidarity conference in Gdansk agreed to ask the government for a clear signal, before the talks begin, that authorities are prepared "to create conditions" for legalizing the labor federation. Solidarity is trying to regain the legal status it lost after martial law was imposed in 1981.

At the first meeting between Walesa and Interior Minister Gen. Czeslaw Kiszczak on Aug. 31, the government agreed to this week's talks on workers' grievances, including the subject of Solidarity. As a result, Walesa within three days persuaded supporters to end Poland's worst series of strikes in seven years.

Moskwa said the proposed preliminary meeting of Kiszczak, Walesa, leaders of strike committees and some Soldarity advisers would "concern union problems."

The government has stressed that the main talks are to include representatives from various social groups, and they will take up other issues of political and economic reform besides Solidarity.

That shows "the authorities' consistent willingness to search for national reconciliation on the broadest possible plane," Foreign Ministry press spokesman Stefan Staniszewski told reporters today.

Solidarity's approach to the talks was outlined by participants in the two-day conference of the opposition called by Walesa over the weekend at St. Brygida's Church in Gdansk.

Activists and intellectual advisers to the union said they wanted the issue of Solidarity's status settled before the round-table talks move on to broader issues.