update type of 0AMOUNT for datasource 0CO_PC_01,0CO_PC_02

Hi,

I'm creating the ODS from the datasource 0CO_PC_01,0CO_PC_02

As I am not familiar with CO data and I noticed there is no unique key field for selecting a record.

If so, what should be a correct UPDATE Type (overwrite/addition) for 0AMOUNT,0AMOUNTVR in the update rule ?