Issue with Blank Value selection in Dropdown List

Hello Experts,
                    I am facing one strange issue in Adobe Forms Drop Down(DD) list. Foll. is the list data which contains a several item data & blank value. After item data selection user must be able to select blank value in case he doesn't want to set the value to Order Unit as shown in screen shot below.
                              Now my issue is after any of the item values selection (for ex. BAG - BAG)  user is not able to set the blank value again at my client system. However its working fine in mine. When checked client is using Adobe Reader 8.0 which is same as mine.
Thanks in advance.
Regards,
  Amit

Hi Steve,
               Thanks for the reply. We have a blank value in the DD as a list item, where key & description is empty space. As i posted above user must be able to select that blank item if doesn't want any value for Order Unit. This selection is working fine in my sytem, but my client facing the issue where he can not select the blank value from DD.
Thanks,
Amit

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