It is stated that the updates in relational use cases Q7, Q8, and Q9 are expected to fail because the document after updating would be "invalid with respect to its schema" (Q7), or would violate "application constraints" (Q8, Q9).

However, there is no schema for the source document, nor does the query contain a "declare revalidation" entry in the query prolog that would force the updated document to be valid.

The problem is reflected in the test cases based on these use cases, which show that the query actually succeeds.