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https://mohsinkhalid.com/2018/03/21/d365-solution-the-property-computedfieldmethod-must-be-set-with-the-name-of-a-valid-data-entity-method-if-iscomputedfield-is-set-to-yes/
#D365 Solution: The property 'ComputedFieldMethod' must be set with the name of a valid data entity method if 'IsComputedField' is set to 'Yes'