You want to set the Rule Type* option, on the Scenario holding that data, to Periodic. That will ensure that data is translated as "Prior period’s translated value + (YTD change from prior period * translation rate)". As the YTD change is 0, the data should stay translated as in the previous months.
If that's not possible, then you'll have to write some custom formula or translation logic.
Is the Solution "Rule Type* option, on the Scenario holding that data, to Periodic" holds good with Balance Sheet data also.
