Due to the design of the query code, multiple predicates, conjoined with
&, that query on the same collection path (either set-valued or enumerated),
would produce incorrect results. Queries structured in this way have been
disallowed, as a result.
Note that queries that can be restructured by optimization to remove the
&, or reduce the predicates to one for the collection path, will not have
this problem and are allowed.
Last updated: 4/30/14