Is it possible to create a validation rule in child object using a field of master object in trigger condition?

Question

As in, is it possible to access (lookup) fields of the master object from a detail object?

Naresh Koya · Accepted Answer

@Anmol Gupta https://trailblazers.salesforce.com/profileView?u=0054S000001nzRDQAY  Yes, that should not be a problem. You can access the Parent field something like this: Parent__r.FieldAPIName

Steven Trumble · Answer

@Megdouda CHEBAH https://trailblazers.salesforce.com/profileView?u=0054S000001U6uuQAC  correct - formula fields can only lookup, not down.

Is it possible to create a validation rule in child object using a field of master object in trigger condition?

Validation Rule

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