Not allow duplicates

[Andrea_Martin]

Hopefully this post is relevant:

Avoiding duplicate selection in repeat group

What is the problem? Please be detailed. I am creating a form where i have a repeat group. Users will enter "Item" in the field. When they add another field in the group, I want them to avoid selecting same item that they selected in the first field. I would appreciate a solution for this problem I am using xls form for this purpose.