Primary Ledger Vs Secondary Ledger
Use secondary ledgers for supplementary purposes, such as consolidation, statutory reporting, or adjustments for one or more legal entities within the same accounting setup. For example, use a primary ledger for corporate accounting purposes that use the corporate chart of accounts and subledger accounting method, and use a secondary ledger for statutory reporting purposes that use the statutory chart of accounts and subledger accounting method. This allows you to maintain both a corporate and statutory representation of the same legal entity's transactions in parallel.
Reporting Currency Vs Secondary Ledger
Reporting Currencies are not the same as secondary ledgers. Looking at the 4 C's that define a ledger, we have a chart of accounts, calendar, accounting method, and currency. If you only need multiple currencies to support your reporting requirements, use reporting currencies. If you need to account for your data using different calendars, charts of accounts, accounting methods in addition to currency, use a secondary ledger.