Coffee, rubber and cocoa exports from Indonesia's Lampung port have stopped since Wednesday due to a lack of official forms needed for shipments, traders said.

The trade office in the key southern Sumatran port has run out of certificate of origin (COO) forms, part of the documentation required for traders to export commodities.

"We're forced to keep goods in the warehouse. Our credibility as exporters is threatened, we are worried that buyers won't buy products from Lampung due to shipment inconsistency," said a rubber trader, who declined to be named.

The head of international trade at Lampung's trade office, Ratna Dewi, confirmed the document was unavailable but said officials expected to resolve the issue soon.

"Shipments are halted for several days now as there are no COO forms," a coffee exporter said.

Government trade office data showed Indonesia's coffee bean exports from Sumatra for November fell 74 percent to 5,948.18 tonnes, while cocoa exports from Lampung province stood at 4,000 tonnes.

Indonesia is the world's fourth largest coffee producer, third largest cocoa producer and the second biggest rubber producer. Most of the commodities are shipped to European countries, the U.S. and Japan. (Reuters)