KARACHI, Pakistan, March 3 —President Agha Mohammad Yahya Khan took steps today that he said should enable the postponed constitutional assembly to convene in a few weeks.

As a general strike spread in East Pakistan in protest against the postponement, the President called a meeting of all major political leaders for next Wednesday to discuss the constitutional issues in dispute be tween the two wings of the country.

But the call for the meeting, which has been set for Dacca, capital of East Pakistan, was denounced tonight by Sheik Mujibur Rahman, the East Pakistani leader. [Reuters reported that he had rejected the President's invitation to it.]

Sheik Mujib, whose Awami League wants regional autonomy for East Pakistan to counter the long‐standing West Pakistani domination of government, favors an immediate convening of the new National Assembly, which his party dominates. In the elections for the assembly last December, it won 167 of the 313 seats.

The Awami League leader has also called for an early transfer of power to the representatives of the people by the military regime of General Yahya.

The assembly was to have convened in Dacca today to start drafting a constitution that would return the nation to civilian rule. But two days ago the President announced that the assembly would have to be postponed because of a dead lock between leaders of West and East Pakistan over the principal features of the charter.

The postponement led to violence in East Pakistan. Demonstrators rampaged through the streets of Dacca yesterday, and a curfew was Imposed there last night. Today, the East Pakistani cities of Rangpur and Sylhet as well as Dacca were under a curfew.

The President, in calling for a conference of political leaders, said that he saw no reason why the assembly “should not he able to meet within a matter of a couple of weeks after the conference.”

Zulfikar Ali Bhutto, leader of the principal West Pakistani party, the leftist Pakistan People's party, announced that he would attend next Wednesday's meeting. Mr. Bhutto, who is strongly opposed to granting East Pakistan the autonomy Sheik Mujib wants, had brought about the postponement of the Assembly session by announcing that his party would not attend.

Without an accommodation with Sheik Mujib, the Bhutto party would be at a clear dis advantage in any Assembly meeting, since it holds only 82 of the 313 seats.

Mr. Bhutto's principal quarrel with Sheik Mujib is over the East Pakistani's insistence that foreign aid, foreign trade and foreign exchange should be the prerogatives of the country's five provinces—East Pakistan and the four provinces of West Pakistan.

Today's Presidential announcement, issued in the interim capital of Rawalpindi, said that General Yahya Khan had sent “personal invitations” for next Wednesday's conference to the 12 leaders of parliamentary groups in the Assembly in line with his pledge earlier this week that he would do all in his power to solve the constitutional crisis.