Action message show current and previous value

[boneyard]

im trying to get the action to send the current value and the previous value of an item, but somehow i can't get it to work

currently i have:
{{HOST.HOST}:{ITEM.KEY}.last(X)}

but whatever i change X to 0,1,2,3,... i always get the current value and seems unable to get the previous value.

what is the best approach to get this working?

[boneyard]

ok, that was a typical case of RTFM, i should be using #1, #2 and such in last(). works as a charm now.