Random NPE while running /Testing Dataservice finctions

hi,
Randomly I am getting the follwing exception while testing the Dataservice from TestView.
Any idea ?
java.lang.NullPointerException: Internal Error: variable '$$f48235_0' not bound
at weblogic.xml.query.runtime.core.RTVariable.open(RTVariable.java:37)
at weblogic.xml.query.iterators.FirstOrderIterator.open(FirstOrderIterator.java:161)
at weblogic.xml.query.runtime.sort.GroupNoSortIterator.compGroupingValues(GroupByNoSortIterator.java:658)
at weblogic.xml.query.runtime.sort.GroupNoSortIterator.initialize(GroupByNoSortIterator.java:532)
at weblogic.xml.query.runtime.sort.GroupByNoSortIterator.fetchNext(GroupByNoSortIterator.java:350)
at weblogic.xml.query.iterators.GenericIterator.hasNext(GenericIterator.java:134)
at weblogic.xml.query.runtime.join.NestedLoopJoinIterator.fetchNext(NestedLoopJoinIterator.java:154)
at weblogic.xml.query.iterators.GenericIterator.hasNext(GenericIterator.java:134)
at weblogic.xml.query.runtime.core.CountMapIterator.fetchNext(CountMapIterator.java:135)
at weblogic.xml.query.iterators.GenericIterator.hasNext(GenericIterator.java:134)
at weblogic.xml.query.runtime.join.NestedLoopJoinIterator.fetchNext(NestedLoopJoinIterator.java:136)
at weblogic.xml.query.iterators.GenericIterator.hasNext(GenericIterator.java:134)
at weblogic.xml.query.runtime.core.CountMapIterator.fetchNext(CountMapIterator.java:135)
at weblogic.xml.query.iterators.GenericIterator.peekNext(GenericIterator.java:151)
at weblogic.xml.query.runtime.constructor.SuperElementConstructor.getPhase2(SuperElementConstructor.java:388)
at weblogic.xml.query.runtime.constructor.PartMatElemConstructor.matEverything(PartMatElemConstructor.java:123)
at weblogic.xml.query.runtime.constructor.PartMatElemConstructor.fetchNext(PartMatElemConstructor.java:197)
at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)
at weblogic.xml.query.runtime.node.SquishEmptyElement.fetchNext(SquishEmptyElement.java:83)
at weblogic.xml.query.iterators.GenericIterator.peekNext(GenericIterator.java:151)
at weblogic.xml.query.runtime.constructor.SuperElementConstructor.getPhase2(SuperElementConstructor.java:388)
at weblogic.xml.query.runtime.constructor.PartMatElemConstructor.matEverything(PartMatElemConstructor.java:123)
at weblogic.xml.query.runtime.constructor.PartMatElemConstructor.fetchNext(PartMatElemConstructor.java:197)
at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)
at weblogic.xml.query.xdbc.iterators.ItemIterator.fetchNext(ItemIterator.java:86)
at weblogic.xml.query.iterators.GenericIterator.hasNext(GenericIterator.java:134)
at weblogic.xml.query.runtime.sequences.Subsequence.fetchNext(Subsequence.java:101)
at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)
at weblogic.xml.query.runtime.querycide.QueryAssassin.fetchNext(QueryAssassin.java:54)
at weblogic.xml.query.iterators.GenericIterator.peekNext(GenericIterator.java:151)
at weblogic.xml.query.runtime.qname.InsertNamespaces.fetchNext(InsertNamespaces.java:238)
at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)

Please zip up and attach your DSP project.
It looks like the column names in the data service metadata do not match. This can happen if you have manually modified the metadata in a dataservice. If you have changed columns in your database tables, it is safest to re-import, rather than manually modify the metadata.
If this is happening for some other reason, I'll figure it out from your project.
If you open a case with customer support, you'll have a better chance at getting this resolved as I'm going on vacation shortly.
- Mike

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