If you manually create a service order in the application component Customer Service and assign an outline agreement item, the system copies the service product and the form of billing from the outline agreement item to the service order.

This function is also available if the service order is generated through a maintenance plan.

As a result, you can assign an outline agreement item to the maintenance item in the maintenance plan. If the system generates a maintenance call object (in this case, a service order), the service product and the form of billing are also copied from the outline agreement item to the service order here.