SAP customers with rental or purchase contracts usually receive an unlimited license key for their systems. SAP customers with demonstration or test contracts receive a temporary license key that is valid for the agreed test period. A new license key must be applied for when this period expires.
Once the license key expires or changes are made to your hardware platform, the standard license is no longer valid. In this case you can use transaction SLICENSE to Install a Temporary SAP License. You can then continue to work fro four weeks with this temporary license key. During this time, you must apply for and install a new license key.
You can check the validity of your license by logging onto the SAP System and reading the copyright or by choosing System ® Status ® SAP system data.