Electronic Credit Reversal and Reclaimed Statements GST

We have not updated the accumulated opening balance in electronic Credit Reversal ledger. 

Since the introduction of Electronic Credit Reversal and Reclaim ledger in GST portal.

We have noticed, now also the ledger is kept open to update the opening balance with current date.

Whether we can update the opening balance now? if yes which opening balance should be updated.

Thanks,

Senthilkumar