un-end dating an element link

 My users enddated an element link they want to use again.  According to Metalink:

End date the existing link and create the needed new link from the next date tracked day is the
only possible solution to this scenario.
However, this will result in the end date of all the associated element entries

This is not a problem for us since this is a non-recurring element.  HOWEVER, when I try to relink the element (enddate was 31-JUL-2008) by datetracking to 01-AUG-2008 I get the following error:

APP-PAY-06398:  This element is not mutually exclusive: 

If it is possible for a person to have an element assigned to them more than once