Can't connect Report to MSSQL XML/A-DataSource

[plange]

Hallo,
First I create the MS-SQL-Server XML/A Data source (JasperReports Server CP 5.5.0a Community, Windows 2008 R2 Server).
It works fine (view 1 and 2)...
Now I upload my JasperReport to root / Reports / PV-Berichte (Vordruck anzeigen V50) (view 3)
If I will connect the Report to my Data source "PVStarProd" then I don’t find the Datasource in the list-View (view 4)

What can I do. Please help

Thanks

Patrick

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