Device Installation 
You can install devices in the following ways:
Technical installation only, for example if a meter is not to be billed. This would apply in the case of a control meter or a meter that belongs to the utility company.
First technical , then billing-related installation, for example if
Meters in an apartment building are installed first and assigned to apartments later
Both steps are carried out by different agents
One technical installation and several billing-related installations. This would apply in the case of a pressure regulator or an ARCR that controls several installations.
Full installation, as in the case of a single-family home.
When you enter the device installation, the device must not have been modified or changed in the system after the actual installation date. The entry in the system must correspond to the actual history of the processes.
Example
You enter the installation on 10/12. The installation took place on 10/08. A device modification or a change to the device data may not have been entered after 10/08.
You must perform a technical installation before you can perform a billing-related installation.
In the case of technical installations, the same prerequisites apply as for the installation of a piece of equipment ( Device ) in a functional location ( Device location ) in the Plant Maintenance application component.
For more information see the following in the Technical Objects (PM-EQM) application component:
Device installation includes the following phases:
An installation order for a device or a device group is created in the Service Management (PM-SMA) application component. This may result from a company requirement (such as a switching change) or an external requirement (new connection),
The installation order is executed and returned.
The removal of the device is entered in IS-U.
Here the device always undergoes a technical installation and if it is to be billed, it undergoes a billing-related installation.
For more information, see Installing, Removing, and Replacing Devices
Note the following:
If the device belongs to a device group, the entire device group must be installed in the case of technical installations and full installations.
In the case of technical and full installations you have to change the register group configuration.
Those registers are proposed for which the PR (Propose register during installation/replacement) field has been selected.
You can change the register configuration in Customizing under Change Register Configuration . You can the select any register in the register group.
Technical installation
The device is installed in the device location. This corresponds to the installation of a piece of equipment in a functional location.
This enables you to use all PM functions for installed equipment.
The system stores technical data for the register.
Device relationships may have been created and a device location is created.
Billing-related installation
The device is allocated to an installation for billing.
The system creates billing-related data for the device and registers of the installation.
The device can be billed.
Full installation
The device is installed in the device location with respect to technical data
The device is allocated to an installation for billing.