Material ledger activation for new plants

HI Experts,

Can you please help me?

We use activated material ledger in our production system. I've done new plants and also activated material ledger for them. After that I received the message C+039 "Material ledger currencies were changed" in transaction mm02.

I've read that we should deactivate material ledger for all plants and then make settings, after that we should activate it again. But it is written in Sap note 425487 that after deactivation

• Prices and inventory values in parallel currencies and their histories are lost.
• The parallel currency records of the purchase order history are deleted. In the case of a new material ledger production startup, the original values cannot be recovered.

Am I right that even if I activate material ledger again history before new activation in other currency will be lost? If I'm not right please correct me. Is there any other variants how not to lose all important information?