Best way to extract data into BW after enhancing COPA datasource - urgent

Hello all,

I deleted and re generated a COPA datasource with the same technical name as the old one to add a field - Posting date (BUDAT) to that datasource.

In BW, we have a DSO and a cube to which is delta enabled and has data since 01.2011.

My question is, what is the best way to get the data into BW now after enhancing my datasource?

Do i delete the data in targets and run full loads for the 2011, 2012, 2013 and run initialization for 2014?

Or, do i do a full repair (which i am not aware of how)?

Could you please provide me the steps for whatever is the best solution to this task? ( looked i SDN couldn't find steps for loading i BW)

I would really appreciate any help from you all,

Thanks in adavnce,

ATV