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Reading 
Process that records the status of a counter at a specific point in time.
You record readings for the object items of a single contract. A reading records general data, such as the current counter status and the unit of measure. The reading also contains application-specific data, such as the reading origin and an option for entering credits.
You configure the Customizing for readings with the activities in the Implementation Guide (IMG) under Usage-Based Billing ® Counters and Readings.
The system assigns a recorded reading directly to a volume overview, which makes it possible to bill for the usage volume. Once an error-free reading has been recorded, you can no longer change it. You can deactivate it with a cancellation, however.
The transaction type describes the reading type – that is, the business purpose of the reading. The following transaction types are available:
· Installation
Once the service department has installed the device at the customer’s site, the installation reading is the first reading you record.
· Dismantling
A device is disassembled before it is removed from the customer’s site. After a dismantling reading, no further readings are possible for the corresponding item.
· Usage reading
Usage readings are usually performed at regular intervals, for example, by the customer.
· Change reading
You can only enter a change reading for a new document or a new document item. You create the new document item with a change process, such as a contract extension.

If you change products, please note that you cannot enter a change reading in this case. Instead, enter a dismantling reading for the predecessor item and an installation reading for the newly created item.
A data record for a reading consists of the following data groups:
· Data for the counter
¡ Unit for the counter
¡ Usage function
Press Counter Details to display additional data on the counter, such as the counter number.
· Data for the counter reading
¡ Reading date
¡ Current counter reading
¡ Difference compared to previous counter reading
· Additional Information
¡ Reading origin
¡ Reading number (default setting: not displayed)
¡ Transaction type (reading type)
¡ Credits
The system saves credits as shortfall quantities. Use the usage function category to categorize the type of credit involved.
· Indicators for
¡ Canceling the reading
¡ Erroneous recording of reading
¡ Allocating the reading to a volume document
¡ Using the reading in estimation procedures (default setting: not displayed)
To apply an estimation procedure, you have to implement it first in the Business Add-In (BAdI) Process Estimation Procedures. For more information, refer to the Implementation Guide (IMG) under Usage-Based Billing ® Record Usage ® Business Add-Ins (BAdIs) ® Process Estimation Procedures.
¡ Using the reading in the credit overview
Credits for the contract appear in the credit overview.
¡ Determining whether or not the reading can be changed (default setting: not displayed)