Diagnosis
You attempted to change the column headers for a field of your list. Todo this, you must place the cursor within the page header area on thecolumn header you want to change.
Please note that, in statistics, you cannot maintain the headers forfields with additional specifications (total number, percentage andaverage value). With ranked lists, you cannot maintain the header forthe field with the rank specification. The names of these fields in theLine structure area begin with the character '*'.