Saving a supplier invoice and saving a service entry sheet are some of the actions that can transfer actual costs for external processing. External processing is a process that involves procuring services from external vendors for project activities. Saving a supplier invoice is an action that records the payment request from a vendor for the services performed and posts actual costs to the project. Saving a service entry sheet is an action that records the delivery of services from a vendor and posts actual costs to the project. Reference: https://help.sap.com/doc/0f069b2e08b748f1b480d4c8b46c3c49/100/en-US/6a7a9f0a6e421014e10000000a174cb4.html