Redemption...

while we are redeeming the preference shares at premium, the premium amount is contributed by the share premium A/c in reserves and surplus...for face value we have two options....either we can get money from fresh issue of shares or from accumulated profits. In case of accumulated profit, we need to transfer the amount equal to face value to capital redemption reserve na sir ?? Why we are transferring that ??What's the logic behind this ? thanks in advance sir...