SAP has reserved name ranges for customer objects and SAP objects. Use these customer name ranges to make sure that your objects are not overwritten by SAP objects during the import of corrections or an upgrade.
This documentation lists thecustomer name ranges for the different system objects.
Only use the customer name ranges. If you do not keep to the name ranges for customer objects you may lose your development objects.
SAP delivers a few system objects with names that fall within the customer name range. These objects already existed when the customer name range was extended from YY*/ZZ* to Y*/Z*. These objects are listed in table TDKZ.
You can reserve and use exclusive namespaces based on the SAP standard for central group development or for the development of your own products (seeDevelopment in Reserved Namespaces).