HI Rao,
Your DSO structure should always be identical to the Flat File structure., even the sequence of fields also important. A direct mapping has to be done in the transformation.
If your DSO contains material plant netvalue 0fiscper, then your Flat File should also contain the same.
You need to basically format the Flat File which should hold the data what you are expecting in DSO.
Note: If you cannot change your Flat File, then create a DSO with 12 KFs along with other chars and load to this DSO. You can create another DSO on top of above DSO. In the mapping, you can map 12 KFs to Net Value KF with 12 rule groups. You may just give a try.
Regards,
Suman