ENUM

LookupPrimaryRelationResolutionEnum

Rule that picks the primary related record when a lookup links several records.

GraphQL Schema definition

enum LookupPrimaryRelationResolutionEnum {
# The record added to the lookup first (default).
FirstAddedIntoLookup
# The record added to the lookup most recently.
LastAddedIntoLookup
# The most recently created linked record.
LatestCreatedWithinLookup
# The oldest linked record.
OldestCreatedWithinLookup
}

Require by

LookupSettingsPropertySettings of a lookup field, such as which linked record is treated as the primary one.