set_of_books_id_11i column in gl_je_batches table in Oracle R12

Hi

We have upgraded from 11i to R12 and while doing some testing, we inserted data manually in gl_interface table with ledger_id = 1. After import, data reached gl_je_batches table but the column which stores ledger id (set_of_books_id_11i) is null. Can someone plz tell me the reason behind this ?

Thanks in advance.