The Law Society has contacted the Preparatory Committee urging it to clear up doubts about the legal basis of the provisional legislature.
The Society's letter says that because there is no 'through-train' for the present Legislative Council, the need for a provisional legislature is understandable.
It adds that the Selection Committee should elect members of the provisional legislature endorsed by the National People's Congress.
The NPC should endorse the provisional legislature on or before July 1, 1997, and should be in place long enough to permit the election of the first legislature, it adds.
But former Society council member Philip Li Wai-yip said the legality of the provisional legislature would still be in doubt.
It would be indirectly elected by Selection Committee members, and would not comply with the composition of the first Special Administrative Region legislature in the Basic Law, he said.