[senhal]

Thanks... but what am I missing?

These are the metadata on the epub before importing it.

    <dc:title>[Divine Comedy 01] Inferno</dc:title>
    <dc:creator opf:role="aut">Dante Alighieri</dc:creator>
    <dc:identifier id="BookID" opf:scheme="UUID">123</dc:identifier>
    <dc:language>it</dc:language>
    <meta name="cover" content="cover.jpg"/>

I add it to the Calibre library and change this:

into this:


Then I open the epub clicking edit book; in the opf I find:

    <dc:title>Inferno</dc:title>
    <dc:creator opf:role="aut" opf:file-as="Alighieri, Dante">Dante Alighieri</dc:creator>
    <dc:identifier id="BookID" opf:scheme="UUID">123</dc:identifier>
    <dc:date>0101-01-01T00:00:00+00:00</dc:date>
    <dc:language>it</dc:language>
    <dc:identifier opf:scheme="calibre">85d48496-d53a-46f2-9765-bd64f89e15a2</dc:identifier>
    <meta name="cover" content="cover.jpg"/>
    <meta name="calibre:title_sort" content="Inferno"/>
    <meta name="calibre:series" content="Divine Comedy"/>
    <meta name="calibre:series_index" content="1.0"/>
    <meta name="calibre:author_link_map" content="{&quot;Dante Alighieri&quot;: &quot;&quot;}"/>

Plus a pair of meta regarding 2 custom columns I use:

<meta name="calibre:user_metadata:#notes" content="{&quot;is_custom&quot;: true, &quot;rec_index&quot;: 23, &quot;table&quot;: &quot;custom_column_4&quot;, &quot;is_category&quot;: true, &quot;#extra#&quot;: null, &quot;#value#&quot;: [], &quot;display&quot;: {&quot;is_names&quot;: false, &quot;description&quot;: &quot;&quot;}, &quot;datatype&quot;: &quot;text&quot;, &quot;is_csp&quot;: false, &quot;is_editable&quot;: true, &quot;is_multiple&quot;: &quot;|&quot;, &quot;search_terms&quot;: [&quot;#notes&quot;], &quot;category_sort&quot;: &quot;value&quot;, &quot;label&quot;: &quot;notes&quot;, &quot;column&quot;: &quot;value&quot;, &quot;is_multiple2&quot;: {&quot;ui_to_list&quot;: &quot;,&quot;, &quot;list_to_ui&quot;: &quot;, &quot;, &quot;cache_to_list&quot;: &quot;|&quot;}, &quot;kind&quot;: &quot;field&quot;, &quot;name&quot;: &quot;Note&quot;, &quot;colnum&quot;: 4, &quot;link_column&quot;: &quot;value&quot;}"/>