EL Expression to conditionally hide an attribute on the Salary region

Summary:

EL syntax to test if the Action Code equals to WORK_HOURS_CHANGE

Content (please ensure you mask any confidential information):

On the Salary region in the 'Change Working Hours' quick action flow, we wish to merely display the pro-rata effect of increased or decreased working hours on the salary. In the Transaction Design Studio, the 'Salary Amount' is seeded to 'Visible' and this cannot be changed. It renders as editable, which we find undesirable in the 'Change Working Hours' flow. 

We wish to hide the 'Salary Amount' with Page Composer only in the 'Change Working Hours' flow and prevent that it is hidden in the 'Promote' flow and in the 'Change Salary' flow. I tried a lot of EL Expressions to test the condition of the Action Name or Action Code or Action ID, however it always evaluates to false. Does anyone know the correct EL syntax to test if the Action Code equals to WORK_HOURS_CHANGE ?