Hi Domenico,
first of all thanks for your reply,
i have all the patchs available for ArcGIS Server 10.1 SP1 installed:
->Mosaic Dataset/Image services reprojection (ArcGIS-101SP1-S-MD-Patch.msp)
->Security Patch (ArcGIS-101SP1-S-Security-Patch.msp )
->SQL Server 2012 (ArcGIS-101SP1-S-SQLSS-Patch.msp)
in attached i sendo two print screens that illustrate the problem....fully qualified names and no alias when making Querys to Feature Classes that have a Join or Relate, Find and Identify Task work as expected!
AS