[sr-dev] no line number given and why is $ru not writable?

if i remember correctly, k told the config file line number where an error occurred and also the name of the function that issued it. sr doesn't do so. see previous message about deprecated pv syntax warnings and now also this: Jun 1 20:24:49 localhost /usr/sbin/sip-router[14871]: ERROR: utils [utils.c:244]: result pvar is not writeble in general, how can i know where the problem occurred? in this particular case, i know where the error comes from: http_query("some_query", "$ru"); the same statement works fine in k. why is $ru not writeble? can i replace it with some other form of request-uri variable? -- juha