Erasing most of its early gains, the rupee was trading higher by six paise at 56.78 against the dollar in early trade today on fresh selling of the US currency by exporters on the back of its lower value overseas.The rupee resumed higher at 56.70 per dollar as against the last closing level of 56.84 at the Interbank Foreign Exchange (Forex) Market.A forex dealer said fresh selling of dollars by banks and exporters in view of its lower value in the overseas market mainly boosted the rupee value.