How to disable field based on the selected value

Hi everyone,
I have "employee" table,
it contains the following field,
emp_name
emp_designation
Category
YearsHere the "category" is the select list value which has the following values in select list,
Fresher
Experienced,
when the value :Fresher" is selected for "category" then the "Years" field should be disabled.
I tried the following dynamic action ,
Name:Disable_year
sequence:20
Event:Change
Selection Type:Item
Item(s):Category
Condition:equal to
value:Fresher
Fire When Event Result Is:TRUE
selection type:P1_YEARBut it doesnt work.
can anyone give alternate solution?
Thank you.
Regards,
gurujothi

Name:Disable_year
sequence:20
Event:Change
Selection Type:Item
Item(s):Category
Condition:equal to
value:FresherTry return value instead of this display value(Fresher) of select list
Fire When Event Result Is:TRUE
selection type:P1_YEARIn your above dynamic action, where is the disable action?

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