You can associate a service-level agreement with the Assignment Service shape in a flow. By defining goals and deadlines, you can set expectations for the time that it takes an external system to complete a single task in the process.
Open a flow by searching for it or by using the Application Explorer.
On the Diagram tab, double-click the Assignment Service shape in the flow diagram.
In the Service level field, press the Down Arrow key and select the name of a service-level agreement.
If you do not select an option, the Work-.Default service-level agreement is used.
Click Submit to close the property panel.
Click Save.
The Service-level agreement icon 
is displayed on the Assignment Service shape to indicate that the goal and deadline are enforced when the flow reaches the shape at run time. Service-level agreements on shapes are independent from service-level agreements that are set on a flow or case type.
Tip: Open the Service Level Agreement form for more configuration options, such as escalation actions that you can run when a goal or deadline are past due.