Fema 1999

Please explain the regulations relating to realisation and repatriation of foreign exchange? This is with reference  to Section 8 of FEMA, 1999.

Please explain the essence of this section 

"Central Government Act Section 8 in The Foreign Exchange Management Act, 1999 8. Realisation and repatriation of foreign exchange.- Save as otherwise provided in this Act, where any amount of foreign exchange is due or has accrued to any person resident in India, such person shall take all reasonable steps to realize and repatriate to India such foreign exchangewithin such period and in such manner as may be specified by the Reserve Bank"