When the export promotion copy of shipping bill is prepared and why?

Firstly you have to understand what EP copy is. Export Promotion, it simply defines to promote the export of some specific articles (metals, etc.). They pay some subsidy at an prespecified rate on different metals known as Drawback. EP copy may be defined as " the document stating the calculations of drawback with rates of drawback & the weight/value of article (whicher is lower) mentioned on it." by prof. Shehzad Aslam. It is prepared only if we have to claim the drawback on any specified invoice or export bill. If we are sending the good to the buyer without claiming for Drawback then there is no need of EP Copy. Hope its clear now.