Correcting drop-down list typos?

We recently upgraded from PPA 2004 to PPAN 2006. This is too recent to have much experience with the new version, but I very much appreciate some of the
user interace improvements that speed up data entry.
One of these is the automatic drop-down list for various fields, based on the actual data in your files.
Unfortunately, there are some typos in this data (vendor's city name, e.g.), so the drop-down list has the same errors. I found the vendor with the misspelled city name and corrected it, but the wrong version is still in the drop-down list.
Anybody know how to remove the bad entry, or reset the list to the current data?
-- Erich PPAM 2006, Win98SE/WinXP, Win2K Server
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