Trading goods export is considered as a exempted services

As per Rule 6(6) of Cenvat Credit Rules, 2004 "The provisions of sub-rules (1), (2), (3) and (4) shall not be applicable in case the excisable goods removed without payment of duty are -

(v) cleared for export under bond in terms of the provisions of the Central Excise Rules, 2002;

Thus, the Cenvat Credit reversal is not required to be made for Export Trading.