YAST2 command line - network card config - do not want YAST to write hostname!

Well, as you can read for yourself, your system is “SUSE Linux Enterprise Server” and this whole forums is dedicated to openSUSE.
My conclusion: you are at the wrong forum. The correct forum is here: SUSE Forums

Now there are some similarities between the two, but be aware of the fact that almost nobody here has SLES running. Thus almost nobody can recreate your problem in the same environment you have. They all have to guess what is going on at yours.
Also there a re a lot of people here that do not even realy know what SLES/SLED is, thus their advises can be well ment, but valid for openSUSE only.

Nevertheless there could be somebody with good advise here, there are some with SLES knowledge around here.

In any case, when you next post computer text here (like the contents of /etc/SuSE-release), pleae opst this by copy/paste between CODE tags: http://forums.opensuse.org/english/information-new-users/advanced-how-faq-read-only/451526-posting-code-tags-guide.html