A subsidiary company is about to configure their General Ledger in a highly regulated country...

A primary ledger is the main ledger for a legal entity or business unit that records all accounting transactions and maintains the accounting balances. A secondary ledger is an optional ledger that is associated with a primary ledger and maintains accounting balances in a different accounting representation. A reporting currency is an optional currency that is associated with a primary ledger and maintains accounting balances in a different currency. In this scenario, the subsidiary company needs to produce fiscal reports under local GAAP and local currency, as well as report to the parent company using IFRS and not local currency. Therefore, the subsidiary company should configure a primary ledger with the local accounting convention and local currency, and a secondary ledger with the IFRS accounting convention and not local currency. A reporting currency with the local accounting convention or the IFRS accounting convention would not meet the requirement, as it would only maintain balances in a different currency, not a different accounting representation. A primary ledger with the IFRS accounting convention would not meet the requirement, as it would not comply with the local GAAP. References:

Oracle Financials Cloud Implementing Enterprise Structures and General Ledger, Chapter 2: Ledgers, Primary Ledgers, Secondary Ledgers, and Reporting Currencies

Oracle Financials Cloud Using General Ledger, Chapter 1: Introduction, Ledgers and Subledgers, Primary Ledgers, Secondary Ledgers, and Reporting Currencies