Dear Unchalee,
The fields are locked but if you do an upload from a local file or you copy the forms from month to month the figures are loaded anyway. So if you load directly from your local accounting you should correct the local accounting cost centers. If you copy the form and adjust the figures for the new month value you shouldn’t do this for the next (September) reporting. For September you should enter the figures directly in the empty CAS form, so you wouldn’t take over mistakes from previous months