How to setup an Amount Override - YTD - to fix historical amounts YTD?

Summary:

Once an amount override has been used in period 1, all the subsequent periods should show this historical amount YTD until the end of the year (on parent currency). How to set up the system?

Content (required):

In the initial period 1, the amount override is correctly written to the parent currency according to the input. 

In the following period there is no change "periodically" and YTD everything remains the same on Entity Currency.

On Parent Currency, however, FCC now converts back to the standard rate according to the standard setup.

On Parent Currency, FCC no longer converts to the historical amount. A periodic change is written to parent currency. This automatically sets the conversion YTD to standard rates in following periods.