We have a oracle RMAN backup running with 35 days retention (According to the policy). Now, there is a requirement to take adhoc RMAN backup with one day retention.  In “resubmit job” window, advanced backup option → media → job retention → for, I selected 1 days (retention applicable on → All copies). 

I am not sure whether it will work because in commvault website, its mentioned that for “ For n Days box is greater than the number of days specified in the storage policy copy retention”

Advanced Backup Options (Media) (commvault.com)

• For n Days: Select this option to prune this job after the specified number of days. Make sure that the value you specify in the For n Days box is greater than the number of days specified in the storage policy copy retention.

If above is correct, is there any way to retain the data for one day, or I have to create new storage policy with one day retention.