Planning book locking from editing KF's

Hi,

I have 2 PB;s, each have 1 data view used by my planners. As per our cycle, after manual adjustments done by planners, we release forecast to SNP on 15th of every month, Each PB has one KF for input option (editable)

We want those 2 PB, data views to be locked from editing after forecast release to last day of every month.

TIA