Transaltion override FCCS

Hello,

in our application we have the need to translate one account using a specific exchange rate.

Here below the case:

The goal is to have in the Plan scenario the data translated according the exchange rate available on the Preclose scenario. In entity currency we created an on demand rule in order to have the same value between Preclose and Plan. How ca we copy the Parent currency figure from Preclose to Plan and avoid the translation of the account in Plan scenario?

Is there a way to manage it?

Thanks

Alessandra