I would like to add to a drop down list that is in a column of an excel
spreadsheet. I can insert a line and then when I try to add or change the
drop down list, I get the following error:
"THE VALUE YOU ENTERED IS NOT VALID. A USER HAS RESTRICTED VALUES THAT CAN
BE ENTERED INTO THIS CELL."

I received this spreadsheet from a coworker that had created it. I believe
they may have copied the information from another spreadsheet. Is it possible
she brought some protected information with it?