[NTG-context] Formula number in right2left direction

Hi, There is a problem in formula numbers in RL direction. I mean in a formula the direction of the number of formula is from left to right. I tried \mathdir TRT and this problem disappeared but two new problems appeared. First, the hole formula typesetted from right to left which shouldn't be. Second, the prantesis arround the formula number get reversed like )a.b(. It would be nice if \mathdir TRT only changes the direction of the formula number (with correct prantesis) not hole the formula. Thanks