what currency should be used for entities that are setup prior multi-book?

AI generated answer (using internal Slack threads):

Based on the conversations, it appears that when setting up Multi-Book accounting, the functional currency of the primary book is used for entities that were set up prior to Multi-Book. This is because the primary book retains the historical data and all integrations and processes tied to it. However, it's important to note that adopting Multi-Book to switch the functional currency for a subsidiary can have a significant impact on the account and reporting out of it. If you already have Multi-Book, you could potentially create a secondary book with the desired functional currency and load the beginning balances into it, moving forward from there. Remember, enabling Multi-Book accounting can be a complex process, especially if you have heavy customizations with journals or are using bundles that might not support Multi-Book. It's also worth noting that Multi-Book cannot be turned off once enabled, so it's crucial to be sure it's needed before proceeding. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******