For the calculated field expression = "Field A + Field B + Field C", simply entering values in fields A and C is not calculated. 

Even if you save or update, the calculation result is not displayed. 

* In field A, field B, field C, the initial value 0 is entered in the numeric input component. 

If you enter the number "0" in the numeric input component, it will not be calculated because it is internally null. 

Click field B with the mouse to see the calculation result. 

Please implement the operation that reflects the numerical input without selecting the field.