@RRSITS You need to add a second iso image; SLE 15 SP3 Packages ISO image
Important: Register at this step
Make sure to register your system at this step in the installation. Otherwise, you can only install a minimal SLE system and will not receive updates.
To install a full (but not updated) SLES for SAP system without network access during the installation, use the SLE 15 SP3 Packages ISO image from https://download.suse.com. You can then choose Skip registration on this page and select the SLE 15 SP3 Packages ISO image as an add-on product on the next page.
@RRSITS Perhaps things have changed on the installer, something you likely need to ask SUSE Support about (Create a support ticket) or your SUSE Partner.
There’s an error in the SLES for SAP Applications documentation - from SLES15 SP2 onwards there is only the one full ISO required for off-line installs with the Installer and Packages ISOs being combined.
“Starting with SUSE Linux Enterprise 15 SP2, the installation medium (‘SLE-15-SP2-Online-*-GM-DVD1.iso’) only consists of the Installer: a minimal, command-line based system for installing, updating and registering SUSE Linux Enterprise products. During the installation you will have the option to add functionality. This is done by the activation of additional modules.”