For managing the SAP licenses, the following tools are available as standard.
To use your SAP systems successfully, they must be assigned with lasting SAP license keys, as described in SAP License Keys.
Additional information is available in the SAP Service Marketplace under the alias licensekeys.
http://service.sap.com/licensekeys
With the measurement program (transaction USMM), you can ascertain the number of users and used engines of the SAP software for each system. You can then pass the measurement results to SAP.
Additional information is available in System Measurement, and in the SAP Service Marketplace under the alias licenseauditing.
http://service.sap.com/licenseauditing
Using the License Administration Workbench, you can consolidate the measurement results of one or more systems, as described in License Administration Workbench. You can then pass the consolidated measurement results to SAP.
Additional information is available in the SAP Service Marketplace under the alias licenseauditing.
http://service.sap.com/licenseauditing