How to inactive(end-date) a reporting set of book

This company used to use a reporting set of book, but now business owners don't use it any more, and when transfer transactions to general ledger from sub-ledger in Primary SOB,

system will report issue because the period of the reporting SOB is not opened, so we have to open the period of the reporting SOB, then the transferring will success.

now users request to end-date the reporting SOB, I checked in system, there is no end_date or inactive field on the SOB defining form. How can I end-date this reporting SOB?

thanks

Jimmy