Open STO report with selection as WE01

Hi,

I am just wondering why the STO (document type UB) is not showing as open item in ME2M report. I used scope of list as BEST_ALV and selection parameter as 'WE01'. If i execute the report with just BEST_ALV i can see the order, but when i use with WE01 it is not showing, any reason? please help me.

Please note that there are no subsequent documents involved (no delivery, no PGI) for this P.O.

Thanks in advance

Regards

Vijay