How to create dynamically updating summary VO?

Hi,
I have a database table holding some Document records. I need to display two tables on OA page.
1. Details Table - showing all the records from the database table and
2. Summaries Table - showing summaries based on one column (currency totals).
First table is a straight forward implementation with an EO and updateable VO.
It is an advancedTable with an LoV attached which can be used to add rows to the table.
When a row is added to it, it is inserted to the EO, but no comitted yet. This is because user can choose 'Cancel' on the page to get rid of all the rows he added.
The summary VO should be ideally based on same EO, so that in memory changes are reflected in the Summary Table.
The problem here is that the EO has primary key and it does not allow a VO to be created without selecting it. If i select it in summaries VO, I cannot write a GROUP BY query.
I need SELECT currency, count(*) from EO GROUP BY currency Any ideas on this?

Hi
one idea ,i can suggest reading this description is ,you can create a dynamic VO ,in EO file itself ,if EO is custom ,then it would be easier to implement.
thanks
Pratap

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