Segments that you do not map from source ledger to target ledger - what will happen with them?

Hi everyone

I am about to figure out consolidation in the Oracle Financial Cloud for a customer where they have a salary ledger/book and a corporate ledger. The calendars and currencies are the same in both ledgers. The COA, however, is different. So a balancing transfer consolidation. For that I need a COA-mapping. 

The corporate book has 6 segments (Company, account, place, purpose, Intercompany and a future segment)

The salary ledger has 20 segments, where the last 6 segment are completely the same as in the corporate book. The first 14 segments are different classification regarding an individual´s salary, hence their social security number, pay scale point etc., to differ each employee from each other. Meaning that each employee has their own account string in the salary ledger.