RMAN report need backup doesn't list newly added datafile

Hi,

I need some help to understand the response I get from the report need backup command in RMAN.

My understanding from the documentation is the following:

the report need backup command (without any parameters) should list all datafiles that need to be backed up to satisfy our current retention policy.

our current retention policy is 90 days, my understanding is that I therefore should be able to do a restore recover until anytime between sysdate -90 days and right now.

So I create a new tablespace containing one new datafile.

I create a table inside this tablespace with some rows in it.