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To create a test installation using openSUSE-Factory-NET-x86_64-Build0687 as installation media I used the installaton systems expert partitioner to remove the existing partition /dev/sda6 and created a new partition /dev/sda6 with the same size (approx. 184 GB) with btrfs filesystem.   After starting the installation an error message pops up saying: 

Bei der folgenden Aktion ist ein Fehler aufgetreten:
Partition /dev/sda6 (183.79 GB) wird mit btrfs formatiert
Der Systemfehlercode lautet -3008
/sbin/mkbtrfs '/dev/sda6'
Error: error checking /dev/sda6 mount status
Trotz des Fehlers fortfahren ?

Switching to the installation systems command line at that point shows that /dev/sda6 is definitely not mounted and that you can also trigger that error from the command line ( trying to run /sbin/mkbtrfs /dev/sda6 ) 

Reproducible: Always

Steps to Reproduce:
1.Start the expert partitioner 
2.delete an existing partition and create a new one in place
3. choose btrfs as filesystem
Actual Results:  
mkfs.btrfs fails to ceate the filesystem on that partition

Expected Results:  
mkfs.btrfs should create a btrfs filesystem