queries with "select new" now cacheable
---------- it can't using in more than one table?

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i want do :
Query query = ss.createQuery("select new SectionalFields(a.x,b.y) from A a, B b");

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problem 1:

For using Class "SectionalFields", we must write codes "<import class="SectionalFields"/>" in *.hbm.xml

if i only do "select new SectionalField2(a.x) from A a", it has no problem.
but i want select fields from more than 1 table.
so i write "<import class="SectionalFields"/>" in A.hbm.xml and B.hbm.xml

error: duplicable import class SectionalFields

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problem 2:

because of problem 1, i only write "<import class="SectionalFields"/>"
in A.hbm.xml or B.hbm.xml
but it can's pass!!!!

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what's the problem? for queries with "select new" can't using in more than 1 table? Or i've done some wrong??