...

​ On Item Change expression is available for Repeatable Field Groups and allows tracking changes of a particular item. model.getIndex() can be used within On Item Change expression to get the index of a changed item. ​

Updating

...

Starting Point data within On Value Change

​You must delay any updates performed from On Value Change to startingPointData and model using a 0ms $timeout. Because $timeout is not available in Field Execution Context, you must create a utility function in one of the Wizard-level onLoad actions:

...