Nepalese/Bhutanese exports to foreign countries will ordinarily be made through Indian ports. In respect of Nepalese/Bhutanese exports made on freight prepaid basis, therefore, freight will be paid to airline/shipping companies or their agents in India. Where shipment is made by an Indian or Nepalese/Bhutanese carrier, freight may be freely paid in rupees. Where, however, other carriers are used, freight is permitted to be collected only in convertible foreign currency. If payment in rupees is offered, it will be accepted only if the rupees have been derived by sale of convertible foreign currency to an authorised dealer and certificate issued by the latter to this effect is produced to airline/shipping company or its agents. Similar regulations are applicable where freight on imports into Nepal/Bhutan from countries outside India is payable at destination i.e., at an Indian port.