How to remove duplicacy in drop-down by using x path constraint not function in selectable objects

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What not function use in xpath constraint to remove duplicate values in drop-down pls tell me
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This can only be done if you populate the dropdown by microflow. In this microflow use a list operation. The list operation should be a union on itself. The list that is generated will not have duplicates, so use this new list as outputparameter being fed to the dropdown.

See also this forumpost

Needless to say, it is better to not have duplicates at all. So if possible cleanse the data or normalize your data model.

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