Rate data 
The rate data of a device provides the basis for billing the device in an installation. Rate data exists at the device and register levels. Rate data at the device level is required for device rental prices. Rate data at the register level is required for settlement of consumption and demand.
Rate data is divided into multiple-installation data and installation-specific data. Multiple-installation data is unique for all installations to which the device is allocated. Installation-specific data is maintained independently of the installation.
Multiple-installation data might include the thermal gas billing procedure and the linear and percentage consumption portion. Installation-specific data might include the indicator for relevance to billing, the rate type and the price class.
When a device undergoes a billing-related installation, it is allocated to an installation along with its rate data.
When the device undergoes a billing-related removal, its rate data is no longer stored historically.
The device has undergone a billing-related installation.
Rate data is maintained historically.
Time slices in periods that have already been billed can no longer be changed. These time slices can only be displayed. However, you can divide one time slice into two slices and maintain them.
Multiple-installation data is displayed on one line with the installation-specific data. If you change multiple-installation data, this affects all installations to which the register is allocated.
If you must maintain the rate data of a register in several installations at once, then you can only enter multiple-installation data in the first line of the register. In the subsequent lines for the register that apply to other installations, the multiple-installation data is only displayed.
In the case of large changes to rate data (such as changes to the indicator for billing relevance or to the consumption portion), meter readings must be entered for the devices. In the case of sub-annual changes, you must enter meter readings manually.