User-Agent:       Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9.0.5) Gecko/2008121300 SUSE/3.0.5-0.1 Firefox/3.0.5

I tried to update a package using zypper:

---
filer:/ # zypper up libasound2
Reading installed packages...
Package 'libasound2' is not installed.
Nothing to do.
---

Zypper claims that the package is not installed. However:
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filer:/ # zypper se libasound2
Reading installed packages...

S | Name             | Summary                                   | Type
--+------------------+-------------------------------------------+--------
i | libasound2       | Advanced Linux Sound Architecture Library | package
i | libasound2-32bit | Advanced Linux Sound Architecture Library | package
filer:/ # rpm -q libasound2
libasound2-1.0.16-39.1
filer:/ # zypper in libasound2
Reading installed packages...
'libasound2' is already installed.
Nothing to do.
---

So, the package is there. Zypper may "wanted" to say that there's no update available. But the package is definitly installed.
regards,
Peter

Reproducible: Always

Steps to Reproduce:
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Expected Results:  
filer:/ # zypper up libasound2
Reading installed packages...
Package 'libasound2': No updates available.
Nothing to do.

... or so...