Hi,
in the first screen shot, you have the situation, that currency type of the controlling area is not configured in FI as a parallel currency. Therefore the flag "only used in Controlling" is marked.
This situation only appears, when you migrate from a ERP Release and you have already configured currencies in FI and CO and you cannot change this, as you transaction data is posted with these settings. (In the blank area below the 1st add. currency another section for the 2nd add Currency would appear, if you would have had 3 currencies configured in FI prior to the migration).
The second screen shots shows the recommended situation, which automatically is active for new installation. This means, the second section ("Global" Currency) is a common currency for FI and CO. As FI support max 3 parallel currencies in SFIN 1503 we need only the section 1st additional currency for the third currency type in FI. The section 2nd additional currency is invisible and cannot be used.
Without common currencies in FI and CO the benefits of the universal journal cannot be leveraged. Therefore we "force" new installation to use this setup.
Best Regards,
Michael