It lacks Appstream metadata:

$ appstreamcli search PlayOnLinux
Unable to find component matching PlayOnLinux!
$ appstreamcli search playonlinux
Unable to find component matching playonlinux!



If you try to install it, it needs an unavailable dependency:

$sudo zypper install PlayOnLinux
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides dbus-1-python needed by PlayOnLinux-4.3.4-1.4.noarch
 Solution 1: do not install PlayOnLinux-4.3.4-1.4.noarch
 Solution 2: break PlayOnLinux-4.3.4-1.4.noarch by ignoring some of its
dependencies

Choose from above solutions by number or cancel [1/2/c/d/?] (c):