I am using various drop down lists in my spreadsheet however when a user
types text rather than selecting the entry from the drop down list the
formatting is not constant. For example. if Jun (proper case) is listed in
my drop down list, the user can enter jun (all lower case) in the cell and it
accepts it. The pivot table reports then have two distinct entries, Jun and
jun.

How can I require the formatting to be consistent with that of the drop down
list?