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Contact Roll Up Summary fields not calculating on person account merge

Knowledge Article Number 000213506
Description Person accounts are setup to function similar to contacts but not all features will work like they do on contacts. Roll up summary field calculation is one of the instances where functionality is limited for person accounts. If you have a roll up summary field that was created on the contact record and you merge duplicate records the roll up summary field on the contact object will not be calculated.
Resolution The solution for this is to create the contact roll up summary field on the account object which will give you the full functionality of the merge process.

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