THE Law Society is noncommittal on legislators' calls for a ban on solicitors representing both buyers and sellers in property transactions. There had been no claims in the past nine months against solicitors involved in such deals. The society said in a written submission to members yesterday that the number of such claims had dropped from nine in 1989-90 to one in 1992-93. It said: ''The unique nature of Hong Kong conveyancing tends to make comparisons with the practice in other countries somewhat meaningless.'' The Solicitors' Practice Rules permit buyers of units in a development, which have not been previously sold, to instruct the seller's solicitors to act for them. The society said the form of sale and buying agreement on which the transaction was based was approved either by the Lands Department or the Chief Justice.