Stock movement report

Dear friends

Good Day,

I am trying to develop report for stock movement that should show daily stock movement of WH1,WH2 with in the date filter.

Report format

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Item number  Description Opening balance Sales Closing balance

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I am selecting Item ledger entry table to generate report.

My quesion are

1) What should be the Key (Posting date, Location code,Item number)  and sum index field Quantity is this OK ?

2) Date Item - Item ledger entry table

                        DataItemTableView - SORTING(Posting Date,Location Code,Item No.) ORDER(Ascending) WHERE(Location Code=FILTER(WH1|WH2))

                        ReqFilterFields - Posting Date

                        GroupTotalFields - Posting Date,Location Code

3) OpeningBalance(ItemNo : Code[20];StockDate : Date) : Decimal

           iteml.SETCURRENTKEY("Posting Date","Location Code","Item No.");
           iteml.SETFILTER("Posting Date", '%1..%2', 311208D,StockDate);
           iteml.CALCSUMS(Quantity);
           EXIT(iteml.Quantity);

i DONT KNOW WHAT WENT WRONG, THE REPORT DOES NOT POPULATE ANY DATA. PLEASE HELP/CORRECT ME.

Thanks

Roy