Read statement with duplicate key fields

Hello,
I have an internal table(EKBE) with 8 fields
ebeln ebelp vgabe gjahr belnr budat wrbtr refkey
populating the first 7 fields from EKBE table with VGABE = 2 and PO#, concatenating the WRBTR and GJAHR to get the Refkey and passing this to the 8th field.
Using this refkey, getting the document numbers from BKPF.
I am looping another internal table into a work area and reading the above internal table by passing the ebeln field and I am doing some calculations ,etc.
A custom table is getting updated from the above work area.
The issue is-
The internal table EKBE can have the same PO numbers with the same line item numbers but with different ref key's.
So, when I am reading the int. tab, it is reading only one record, since I have no other key's to read except EBELN. So for one PO# it is reading only 1 ref key, I cannot use the line item# as a key, as the line item#'s never match, even if they match they could be same PO# with same line item# and different ref key.
Any inputs highly appreciated.
Regards,
Kiran

Loop on EKBE Internal table as well to fetch all entries of PO. Use Parallel cursor to optmize performance.
http://wiki.sdn.sap.com/wiki/display/Snippets/ABAPCodeforParallelCursor-Loop+Processing

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