For example, if we have a custom amount property on Contact records called "Engaged Value", on the Company record we want a field "Total Engagement for all Contacts" that always shows the current sum for the "Engaged Value" of all the associated contact records. We actually need it for Deals-Invoice (custom object) relationship so we can show the total invoiced amount on the deal, so the solution will need to work on custom objects as well as standard objects.
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