Country Activation Currency Scope related [Urgent]

1. Local currency (Company Code currency) vs Group currency

l Are Local and Group currency selectable in any accounting report?
I believe Company code currency is selectable in any reports but group currency looks like some apps aren’t selectable as below.

Balance Sheet/Income Statement

Company Code and Group currency are selectable.

Manage Journal Entries

Company Code is selectable. Group currency are not selectable. (Please correct me if I’m wrong.)

2. Local currency vs Group currency vs Functional currency (Currencies | SAP Help Portal)

l Are there any restriction and functional differences between them?

l What are the pros and cons of those currencies?