Using Sick Days as Vacation Days

I am an assistant in the Petah Tikva municipality. We are paid based on our presence at the workplace, even if there is no actual practical work. Is it permissible for me to use sick days for vacation purposes even if I am not actually sick? Apparently, my superiors consider it acceptable to use these days as optional vacation days.

Hello and blessings 

If it is acceptable to the employer, there is no problem. 

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