Hi,
In your file, the row for summarized data for a document might be having blank in the item column.
You can create 2 infopackages 1 for each DSO1 and DSO2.
In your Datasource, give selection fields as Document no and item no.
Now in 1st Infopackage for DSO1, give selection as item no. = blank.
And in 2nd Infopackage for DSO2, give selection as item no. not equals blank.
In this way, the summarized data will be loaded to DSO1 and the item level data will be loaded to DSO2 from the same file.
Hope this helps.
Thanks,
Akanksha