Prerequisites
Warranty counters are normally defined by your system administrator at the time of setting up your system. If you have the necessary authorizations, you can create warranty counters using the Classification System.
Procedure
To do this, choose Logistics
The screen Create Characteristic is displayed.
In the block Formatting, enter a numeric data type.
For more information, see the SAP documentation on Characteristics under CA-Classification.
Plant Maintenance and Customer Service ® Master Data in Plant Maintenance and Customer Service ® Basic Settings ® Warranties ® Define warranty counter.

Only warranty counters that are entered in Customizing are recognized as valid counter types by the system.