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There was an issue in IWS that could result in duplicate node and mapping. The following steps may reproduce this issue:
In IWS, create or open a translator or XSLT translator worksheet
Populate the destination grid
Open one of collapsed nodes and do a mapping
Then collapse and expand this node quickly
The node and mapping may then be duplicated. The code was updated to resolve this issue.
This issue was tracked as Item #123624.