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Cheri L.Cheri L. 

Create cross-object checkbox formula to reflect custom object checkbox

My summary custom object should present a set of checkboxes that reflect whether or not the "finished" checkbox is checked on other custom objects. But my formula is getting is syntax error that Request__r doesn't exist, though that's the correct name of the custom object I want to reference — IF(Request__r.FORM_COMPLETE__c, TRUE,FALSE). That's wrong here?
Nayana KNayana K
User-added image

please check API name is lookup/MD field on child object is Request__c. Object name can be anything but field name matters here.
In above image, say Parent object name is Mother but while creating relationship name field name is Mother_of_child.

https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_relationships_and_custom_objects.htm