Creating a service definition for invoice approval To create a custom invoice routing flow, you must first create a service definition. Select Process Server Administrator > Configuration > Service Definitions. Click New. Specify this information: Service Specify a service name. Description Specify a description for the service. Service Is Enabled Select this check box to enable the service definition. Criteria Name 1,2,3 Optionally, specify a criteria name. Click Save. On the Processes tab, click New. Specify this information: Service This is pre-populated with the service name. Process Definition Select InvoiceApproval. Service Process Is Enabled Select this check box to link the service definition to the process. Criteria Name 1,2,3 Optionally, specify a criteria name. Click Save.