Can we limit editing an editable key figure for a certain time ?

Hi,

We have a requirement for editing a key figure for certain month and it should be not editable for rest of the month. Suppose I have key figure and the time time span for that excel planning view is 12 months. Now we want that the key figure should be editable for first 6 months and not-editable for next 6 months. Is it possible via configuration or EPM formatting ?

Thanks,

Achal