Do you always need to unlock all prior periods when you want to add a new currency in "dimensions"?

Summary:

Adding a new reporting currency and having to re-translate from the very beginning years.

Content (please ensure you mask any confidential information):

We had an input currency that I recently checked the box for "reporting currency" so we could use it on our variance reporting. I was then told that I had to go back and translate all prior periods since we never used this before. I did so, but only the current period was actually pulling in numbers (on smartview or reports).

I then went and unlocked all the prior periods (each month for the last 8 years since we moved to Oracle) and re-translated all those prior years, and it works now.