How to define Version in BCS

Hello experts,

could you please help to check these questions? Thank you in advance.

when I create a Version in BCS, there is only "name" to be defined and nothing else. Did I do something wrong? If not, how does the system know that this version applies IFRS?

And where to maintain the actual calculation rule which is IFRS?

Thanks again.

Best Regards,

Elma