onChange rule will not trigger when assigned under Foundation Object.
Example: onChange rule to set a custom field in 'Location' object when any of field in Location is changed.
Result: The custom fields are not set and Location page keeps on loading forever.
Employee Central - Foundation Objects
On Foundation Object UI only onInit and onSave rules are supported.
There is an enhancement request open with Product Team with enhancement number ECT-24628.
The fix plan is not yet commited and this functionality would be included in future roadmap.
onChange rule in foundation object Manage Organization pay and job structures , KBA , LOD-SF-EC-FOO , Foundation Objects - MDF & Legacy , LOD-SF-EC , Employee Central , LOD-SF-EC-RUL , Business Rules & Event Derivation , Product Enhancement