The libmilter package description shows the following:

provides: libmilter.so.1.0()(64bit), libmilter1_0 = 8.17.2-lp154.359.1,
libmilter1_0(x86-64) = 8.17.2-lp154.359.1

We try to build a package (benno-milter) wich requires libmilter. In our
specfile we therefore we placed: 

Requires: libmilter1_0

If we try to install our package zypper answers with:

nichts stellt 'libmilter.so.1.0.1()(64bit)' bereit, das vom zu installierenden
benno-milter-2.10.0-lp154.5.1.x86_64 benötigt wird

It seems that "provides: libmilter.so.1.0.1()(64bit)" is missing in the
libmilter1_0 package.

Regards Stefan