Currency symbol in Timesheet doctype

Hello,
I am trying add two custom fields to Timesheet. First is a link for Currency (js_currency), the second one is currency field with js_currency in option (js_cost). But “js_cost” is not showing the symbol of the currency (ex.: EUR 50,00).
Is currency working on Timesheet doctype?
Pictures attached.
Thanks for answer in advance.



Field must be read only for currency showing.