ntity</span><span class="special">&lt;</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">&gt;</span></code> to <code class="computeroutput"><span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Z</span><span class="special">&gt;</span></code> is allowed if <code class="computeroutput"><span class="identifier">Y</span></code