Calculate filed in expression (KPI)

[areko1231]

Hello,

I want to calculate the field in Count formula. See below : 

Count({left(Order,2)-="WO"} Sign)

Sb could tell me what is wrong in this formula? 

[Vegar]

Try this:

Count({<Order-={"WO*"} >}Sign)

[areko1231]

Run. Thanks !