Hello Arnold,
Locking cells in input form can be achieved Using
1."Edit Report -> Read Only data".
here we can select the member based loking in the template.
2. =epmreadonlydata(). this function also helps us to lock data and is flexible enough to have a choice of cells to be locked.
3. Using "Data Validation". Here we give formula to the range that needs to be locked. =IF(A1="Actual",0,1)
Regards
Praveen