How to control loading behavior?

Hi Experts,
I have a quuestion:
for example, I want to load data from two R/3 DataSources to a DSO.
DataSource A has fields likes this:
a b c
DataSource B have field likes this:
a d e
DSO have fields likes this:
a b c d e a is the key filed
if we want to load data from two datasources to DSO, if DataSource A load first, then DataSource B load second, during DataSource B loading process, if it find there is a same value for key field "a" exist in DSO, it just update field "d", "e" for field "a", it will not overwrite old one.
so how to achieve this object? thank you for your suggest in advance.
Kind Regards.

Hi,
Welcome to SDN.
Just do the mappings from the rescpective data sources for the fileds which are present there.
That is map a b c from the data source A only in the tranformation
and map a d e from the data source B only in the transformation.
The data source A will only overwrite the values for b and c and not the fields which are not mapped...
similarly when data source B is loaded it will overwrite the value of d and e for the same key value in DSO and will not update the DSO or create a new record.
So it will oevwrite the old one for the mapped fields only and not all the fields
Thanks
Ajeet

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