SAP GTS data migration

Hi All,

During the data migration from legacy system to SAP GTS, what are all data do we need to consider apart from below data for the compliance and customs process,

->Customer/Vendor data from Legacy system to SAP ECC then to GTS

->Product master from Legacy system to SAP ECC then to GTS

->Product classification numbers(ECCN's and HTS codes)

it would be great some one shares the GTS Data migration elements and process etc.

Thanks.

Sunil.