You can't define an order through the UI, but you can do so through your
XPath expressions. Say you have 3 XPath expressions: `a`, `b`, and `c`, then
you can rewrite them as `a` (unchanged), `b and not(a)`, `c and not(a) and
not (b)`. This way, at most one error will show, and if there are multiple
problems, they will show in the order you specified. You'll let me know if
this works for you!