Where I can find such a package "SLES_SAP-Release"
regards
---------------------------------------- extract of the migration script execution --------------------------
Exchanging release packages...

+ cp -p SLES.prod-red28-05 SLES.prod
cp: cannot stat ‘SLES.prod-red28-05’: No such file or directory
+ zypper -n install -f SLES_SAP-release sles-release
Warning: The /etc/products.d/baseproduct symlink is dangling or missing!
The link must point to your core products .prod file in /etc/products.d.

Loading repository data...
Reading installed packages...
Forcing installation of 'sles-release-12.1-1.331.ppc64le' from repository 'SLES12-SP1-12.1-0'.
Package 'SLES_SAP-release' not found.