Download the following RPM file to the server running SUSE Linux Enterprise Server 12 SP3. It is not required that the system (the source system) be registered with SUSE Customer Center (SCC).
Install the RPM:
# zypper in migrate-sles-to-sles4sap-12.3-1.8.noarch.rpm
After installation run the interactive script and follow the on screen instructions:
NOTE: It is required to have your email address as well as a valid registration key for SUSE Linux Enterprise Server for SAP Applications (the target system) at hand.
# sudo /usr/sbin/Migrate_SLES_to_SLES-for-SAP-12.sh
NOTE: In case packages are installed that have dependencies against IBM Java, it may be needed to reinstall them at the end of the procedure.
A reboot of the system is not necessary unless packages which require a reboot are also installed from the newly added channels.