SQLServer import problem

Made import from SQL Server, tables imported correctly, but "Preview data" does not work also this essor is in the message lock
"Unable to select any database object(s) that match sa"
eclipse.buildId=M20110210-1200
java.version=1.6.0_04
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=it_IT
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.java.product

Any hint?
Thanks
Luca