Zabbix 3.0 Calculated item doesn't calculate MAX

[vadims06]

Hi, all,
i have created calculated item with following tabs:

key: cpu_max_4w
Formula: max("Access_switch2:.1.3.6.1.4.1.9.2.1.56.0",4w)
Type: Numeric(unsigned)
Data type(decimal)

and this item shows 0 value, inspite of Access_switch2 cpu load (item .1.3.6.1.4.1.9.2.1.56.0) shows max load is 65%.

What is wrong in my calculated item?

[glebs.ivanovskis]

Use item key there, not OID.