Source: AccountTerritoryAssignmentRuleItem

This object represents a row of selection criteria for an AccountTerritoryAssignmentRule object. AccountTerritoryAssignmentRuleItem can be created or deleted if the BooleanFilter field on its corresponding AccountTerritoryAssignmentRule object is a null value.

Unfortunately it is impossibile for me to show you how to use this object because I don’t have a Salesforce ORG with the old Territory Management system, which allowed this kind of assignment rules.

For more details read the AccountTerritoryAssignmentRule blog post.

If you have an ORG with this kind of territory management enabled, feel free to write a simple guide on how this object work!