Defining Key -field and data fields

Hi all
i have to define Key-Fields and data-Fields for a DSO(say DSO3).
DSO1 is a combination of DSO2 and DSO3..
DSO1 and DSO2 are SAP defined DSOs.
DSO3 is a User defined DSO.
my assumption:
   DSO3 has 30 fields
   DSO2 has 16 fields.
   can i create the DSO3 with remaining 14 fields which is there in DSO1?
   or i have to create the DSO3 with 30 fields(all DSO1 fields).
can any body explain....
Thanks & Regards
krishna

The problem is not how many fields you create where, the issue is where is the data is going to come from.
Since you data is going from DSO3 to DSO1and if the field is already getting populated in DSO1 from DSO2, then you don't have to worry about populating those fields again, unless and otherwise you want to overwrite them.
Remember any fields exist in both DSO3 and DSO2 which overlapping will be overwritten by the latest update.
Again, going back to your question, you should consider does your datasource has missing fields (14 of them).
thanks.
Wond

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