Secondary Cost Book for existing implementation

Hello,

My client would like to start tracking Actual Costing for each past and future inventory transaction (using a ledger-less Cost Book), in addition to the Primary Cost Book, which is used for Standard Costing.

Client is live with Oracle for several years now.

We tried to create a new Cost Book, and run Create Cost Accounting Distributions, but we see multiple errors related to insufficient inventory on-hand balance, and we cannot re-create the inventories from past years.

Is there there a best practice to add a ledger-less Cost Book for an existing implementation, without all of the above inventory balances' errors?