Creating an invoice assignment rule An invoice assignment rule is used to determine which AP Processor will be assigned to a certain invoice. Select AP Administrator > AP Automation Setup > Invoice Assignment Rules. Click Create. Use the following guidelines to specify field values: Name Specify a name for the new rule. Description Specify a description for the rule. Invoice Assignment Rule Select the custom group that determines the invoices that the invoice assignment rule applies to. To create a new custom rule, see Creating custom groups for AP Invoice Automation. Resource Select the resource to whom the invoice will be assigned to when the condition is met. Click Save.