Displaying Trigger level at graphs

[Crypty]

Hi all,

I have a graph with RSS signal strength (dBm) which has negative values. If I use this trigger condition:

{R:rss.last(#1)}<-70

Then it works, because if it droppes under the 70 dBm level, it triggers a message.

BUT, the line doesn't appear in the graph. The other triggers has a lining at the graph concerning the watched value, but not in here.

Is that somehow connected with using negative value?

I use Zabbix 1.8.12

Thanks!