Trading currency for delisted and active rics (or exchange)

I am loading data on TR.TotalReturn, apparently it can be pulled only
in some default currency. I am trying to find out which currency for
each id of interest. TR.TotalReturn.currency does not work. I have tried
your suggestion:

> get_data("B0VKMC4", 'TR.PriceClose.currency')
  Instrument Currency
1    B0VKMC4      EUR

But then I also get

> get_data("B0VKMC4", 'TR.FundCurrency')
  Instrument Currency
1    B0VKMC4 USDollar

Is there any way of knowing what TotalReturn's are measured in?

@barbara.bukhvalova
When you raise a new question, please start a new thread. Otherwise your post is easily missed when it appears as a comment on an existing thread.
This fund invests in USD bonds. The NAV is calculated in USD and this is what the TR.FundCurrency represents. The fund is listed on European exchanges where it's traded in EUR. The price source for total return calculation is the exchange, so the currency of TR.TotalReturn is the same as the currency of TR.PriceClose.