fixed outdated transaction.commit(1) call in ZODBMountPoint.SimpleTrailblazer

doc/CHANGES.txt

@@ -198,6 +198,9 @@ Zope Changes
 
     Bugs Fixed
 
+      - fixed outdated transaction.commit(1) call in 
+        ZODBMountPoint.SimpleTrailblazer
+
       - Fixed against-the-rules zope.conf option 'fast_listen' to read
         'fast-listen' (dash, not underscore).
 

lib/python/Products/ZODBMountPoint/MountedObject.py

@@ -60,7 +60,7 @@ class SimpleTrailblazer:
         o = context.restrictedTraverse(id)
         # Commit a subtransaction to assign the new object to
         # the correct database.
-        transaction.commit(1)
+        transaction.savepoint(optimistic=True)
         return o
 
     def traverseOrConstruct(self, path, omit_final=0):