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On Change Reaction

The React generation ruleas two source fields, one is the observed source and the other is the producet source. This React generation rule reacts to changes in the observed source by updating or reseting the producer source. Finally, it always produces the value of the producer source.

When the React field has to update its value for a new record it starts by looking at the observed source field to see if it has changed its value from the last record. If so then the React either update or reset the producer field.

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