Using relationships in local variable

In my Appian Exercise, I have a interface where i'm getting a record of particular record type ("employee") using a rule and storing it in local variable.

local!employeeDetails: rule!EE Employee("1"),

i'm using this local variable in textfield. 

label: "Employee Department",
labelPosition: "JUSTIFIED",
value: local!employeeDetails[recordtype!EE Employee.relationships.EE Department.fields.departmentName],
characterLimit: 255,
readOnly: true

This large font coding is not fetching me value, giving null value

Please help

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