DSO key field and data field design

Hi All,

In our ECC system we have created generic function module data source.

The extract structure have 16 fields. This fields we are getting from FEBKO, FEBEP ecc tables.

Here i have a concern. In standard DSO, on what basis i have to bifurcate those 16 fields as key fields and data fields.

Requirement is i have to create standard DSO and doing full load daily.

Regards,

Manjunatha