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Single Contract 
A service contract that also includes an agreement for the usage volume. The contract defines the services and specific conditions for the usage volume.
Single contracts contain the following data:
· Price agreements
· Validity periods
· Business partner data
· Billing plans
· Object lists
In addition, single contracts contain a flat-rate charge for a certain usage volume – such as the number of copies for a copying machine. The lease is billed on a flat-rate basis, which means the leasing installment for the copying machine already includes a certain number of copies. The customer pays the flat rate regardless of whether or not all the included copies were made. If the number of copies made exceeds the included number, the customer pays an additional fee.
The billing plan of a single contract can contain several schedules for a service product.
A credit overview for updating the billed volumes and values is integrated in the contract.
The volume overview in the contract contains all the usage-related information required for billing.
The control data required to manage Usage-Based Billing, such as controls for pricing and readings, is contained in the contract.
The contract contains a service item, which describes a service product. In turn, this service product is assigned a physical product, which describes the “machinery” for which the service is offered and which records usage – such as a copier that is serviced and has a certain usage of copies.
You can link single contracts with pool contracts. These pool contracts calculate the actual usage, based on all linked single contracts. When you bill usage volumes and flat rates, the system takes existing credits and the actual usage volumes into account. For more information, refer to Pool Linkage.