Hi Anil,
You will need to select from table /SAPSLL/CTSNUM to find the GUID of the Tariff Code; then select from table /SAPSLL/PRCTS to see if & where that code is already used in Product Classification. For the same Product(s), then select again from /SAPSLL/PRCTS to see if classifications also exist for EU Legal Regulations. If they do, then another selection from /SAPSLL/CTSNUM should bring up the Tariff Codes already assigned.
Hope that helps.
Regards,
Dave