Can't make standard trigger work

[olegff]

Hi, here is the problem:

{WS-#:vfs.fs.size[d:,free].last(0)} item shows 20.66 MB in Latest Data

Trigger {WS-#:vfs.fs.size[d:,free].last(0)}<50000 is OFF in events and triggers

What should I do to make this trigger show ON when disk space is low?

tnx