Hi,
Changing a DATE field to a CREATEDATE field is a good solution for documents
that are created and completed on the same date. However, when a document is
modified on a subsequent date, a user may want to freeze the date on the date
when the document was last modified. This can be done by locking the contents
of the DATE field. To lock a DATE field (or any other field) so that it will
not be updated again, place your cursor within the field and press CTRL+3 or
CTRL+F11. To unlock a field so that it can be updated, place your cursor
within the field and press CTRL+4 or CTRL+SHIFT+F11.