Measure to display default value based on default attribute in PowerBI

Hi,

I have scenario where the measure should display default value based on default attribute when measure alone is used.
Whereas measure should slice it's value when particular attribute is selected.
E.g.,
Employee table: 

Salary table: 

As default when only Salary column is used then it displays sum of all the Salary.
Instead of summing up all the Salary, it should sum up only where Department=HR as default.I created custom measure for this, default behaviour is working fine but when EmpName attribute and CustomSalary measure are used then Total value displays default value. 

Please advice how to overcome this.

CustomSalary = IF(
HASONEFILTER(Employee[EmpName]) ,
SUM(Salary[Salary]),
CALCULATE(SUM(Salary[Salary]),Employee[Department] = "HR" )
)