service tax rules for clearing & forwarding agent

dear all,

1) recently i came across one case where a shipping company reimburses expenses to clearing & forwarding agent in respect of clearing of goods from port trust

2) to get the reimbursement c & f agent raises a debit note on his own letter head plus he issues a seperate invoice for his service charges

3) alongwith reimbursement bill he also attaches port trust's documents on which port trust has charged service tax but the same has not been shown seperately in the debit note

4) now my question is whether the shipping company is eligible to get credit of the service tax charged by port trust authorities and whither the asessee company (shipping company) should deduct tax at source on reimbursement of expenses

can anybody help me out?

waiting for ur replies

thanks in advance