__builtin__.get_transaction() is officially deprecated in ZODB 3.4.

Got rid of it in the Zope source.  The remaining instances are in
code stitched in from ZODB.  Those will go away by magic when
ZODB 3.4 gets stitched in.

Version.py

@@ -25,6 +25,8 @@
 from OFS.ObjectManager import BeforeDeleteException
 from cgi import escape
 
+import transaction
+
 class VersionException(BeforeDeleteException): pass
 
 manage_addVersionForm=Globals.DTMLFile('dtml/versionAdd', globals())
@@ -154,7 +156,7 @@ def save(self, remark, REQUEST=None):
             s=self.cookie
             d=self._p_jar.getVersion()
             if d==s: d=''
-            get_transaction().note(remark)
+            transaction.get().note(remark)
             db.commitVersion(s, d)
 
         if REQUEST is not None:
@@ -168,7 +170,7 @@ def discard(self, remark='', REQUEST=None):
             Globals.VersionBase[self.cookie].abort()
         else:
             # ZODB 3
-            get_transaction().note(remark)
+            transaction.get().note(remark)
             db.abortVersion(self.cookie)
 
         if REQUEST is not None: