Hi Mohammed,
If you have the Action "Change System Locking" set to Full in your access group, it will allow you to either change or remove the locking dates.
Alternitavely, you can add a locking exception by going to:
Module: System > Settings > Locking Exceptions.
From here you can enter the period start date, end date, define as unlock and the relevant register.
Please let me know if you have any questions.
Kind Regards,
Adam Pember