Nested calculated items

[PavelPolyakov]

Hi,

I have 2 calculated item, which are:

analytics.sms.send.code.action.false.sum.600
sum(analytics.sms.send.code.action.false[total],600)

and

analytics.sms.check.code.false.sum.600
sum(analytics.sms.check.code.false[total],600)

I want to register the 3rd one, which would be based on two above.

Like:
analytics.sms.check.code.success_rate
analytics.sms.send.code.action.false.sum.600/analytics.sms.check.code.false.sum.600

As soon as I do that, I have an error in my zabbix logs:

2744:20141016:151301.202 item "analytics.sms.check.code.success_rate" became not supported: Format error or unsupported operator. Exp: [analytics.sms.check.code.false.sum.600]

Does somebody know, if it's possible to use calculated items in the formula of the different calculated item?

Regards,