rpm dependency resolution with 'Provides'/'Requires' statements in spec file not working as expected

Issue

We build a RPM package with rpmbuild the following is a part of the used SPEC file:

Name: example
Version: 1
Release: 2{?dist}
Provides: example
...

A second package we build should have a dependency on a specific version/revision of the first package. The SPEC file contains also this:

Name: foobar
Version: 1
Release: 2{?dist}
Requires: example = %{version}-%{release}
...

When using the resulting RPM files the package foobar accepts any version of the installed package example instead of requiring this specific version/release combination, why is that?