SAP COPA DataSource Creation

Hi,

I am currently working on creation of Cost Based COPA Datasource(Line Item Data Extraction).

For Creation of COPA DS, I know that we need to have Operating Concern.

Based on this four tables are formed stating CE1XXXX (XXXX means Operating Concern), CE2XXXX, CE3XXXX and CE4XXXX.

CE1XXXX contains line Item Data as I know.

What is my requirement is to extract Line Item Data, For that what i did is

I created COPA DS based on Operating Concern and selected the fields i needed.

My Dought is, In Operating Concern we are having some fields and while i check in CE1XXXX we are having more no of fields than in Operating Concern?

And also In operating concern we have less fields and while creating DS we are getting more no of fields, Can I select all the fields what ever we need at DS creation level?

Can these fields get data?

Please provide me the needfull answer.

Thanks in Advance.