AutoYaST installation using multiple skip_list options within partitioning section fails with "merge" error

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Environment

SUSE Linux Enterprise Server 12 Service Pack 4 (SLES 12 SP4)
SUSE Linux Enterprise Server 15

Situation

Identifying disks by e.g. size rather UUID's as those are changing installing multiple instances.

AutoYaST installation using multiple skip_list options within partitioning section fails with "merge" error:

2019-10-23 09:50:29 <2> install(5389) [Ruby] yast/builtins.rb:586 tostring builtin called on wrong type Class
2019-10-23 09:50:29 <3> install(5389) [Ruby] yast/wfm.rb:253 Client call failed with 'no implicit conversion of nil into Hash' (TypeError) and backtrace ["/usr/lib64/ruby/vendor_ruby/2.1.0/yast/builtins.rb:393:in `merge!'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/builtins.rb:393:in `block in listmap'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/builtins.rb:392:in `each'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/builtins.rb:392:in `listmap'", "/mounts/mp

Resolution

During installation section partitioning set up only the operating system disk. Data disks and partitions can be set up via post install script.

Cause

The skip_list is defined under a specific disk, but only once a skip_list can be defined.

Disclaimer

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