Rule action when consumption item counts up

I have an Item which gets updated from a sensor meassuring waterconsumption. The item always shows the meter value in m3.

Items:

Number Watermeter_Liter “Waterusage [%.3f m3]” (watermeter) { mqtt="<[raspi:sensor/watermeter/waterusage/cubicliter:state:default]" }

This works - and I can show the current value in my sitemap.

Now, I want to make a rule which is triggered when this number is updated - and can do calculations based on it - i.e. start a timer and react if there are too much water consumption in a period of 5 min or so.

I have a rule which looks like this:
rule "bla bla bla"
when
item Watermeter_Liter changed
then
xxxxx do something xxxxxxxxx
end

but the rule never gets triggered? - what causes this ? I tried to use “recieved update” instead of “changed” in the when clause - but that gave no difference…

I am new to rules - any help would be appreciated…

Please ensure that upper/lower case is correct:

rule "bla bla bla"
when
    Item Watermeter_Liter changed
then
    logInfo("bla","Rule triggered")
//  xxxxx do something xxxxxxxxx
end

Thanks ! - rookie mistake. I got it now and it works !