Fuctional balance of and account is zero, why is the translated balance not zero

EBS R12.2.3 General Ledger Translations.

We have and account that was adjusted to 0.00 in the current month. Because lots of activity happed in prior periods and average rates were different in those periods the currency translated balance is not 0.00 and is actually relativly high. This seems to be the intended functionality and there is no code to recognize a 0.00 functional balance and roll it to CTA.

Is this normaly behavior? What would a company due that wants this translated balance to also be zero without having to maintain historical amount/rate going forward for such an account that could fluctuate from a high amount and 0.00?