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This node maps upstream static or dynamic work items to downstream static items using an expression. For more complicated mapping logic, it may be easier to use a Python Mapper
Map Static Expression
The expression used to determine which upstream static items should be mapped to which downstream static items.
Map Dynamic Expression
When Use Dynamic Mapping is enabled, this parameter can be set to defined the expression used to map upstream dynamic items to downstream static items.
This example demonstrates how to use the Map by Expression node to establish dependencies from downstream to upstream work items.