If you noticed that you can’t enter a provision past a certain date, this means it is time to roll over your 12-month period.
You started on the (Start date of the account) for your first 12-month period, so your new 12-month period should have started on the (Start date of this year) this year. This is the reason it will not let you record provisional data in the wrong 12-month period for accurate reporting, so you can get a clean snapshot of the 12-month periods.
To unlock your new 12-month period, you can click on the rollover button and follow the prompts. You may refer to this link for reference on Ben’s video tutorial.