<div class="ui tab" data-tab="taxonomy">
    <h3 class="ui dividing header">{{ 'sylius.ui.taxonomy'|trans }}</h3>
    <div class="field">
        {{ form_label(form.mainTaxon) }}
        <div class="taxon-select ui fluid search selection dropdown">
            {{ form_widget(form.mainTaxon, {'attr': {'class' : 'autocomplete'}}) }}
            <i class="dropdown icon"></i>
            <div class="default text">{{'sylius.ui.select_taxon'|trans}}</div>
            <div class="menu"></div>
        </div>
    </div>
    <div class="ui divider"></div>
    {{ form_row(form.taxons) }}
</div>

<div class="ui tab" data-tab="taxonomy">
    <h3 class="ui dividing header">{{ 'sylius.ui.taxonomy'|trans }}</h3>
    <div class="field">
        {{ form_label(form.mainTaxon) }}
        <div class="taxon-select ui fluid search selection dropdown">
            {{ form_widget(form.mainTaxon, {'attr': {'class' : 'autocomplete'}}) }}
            <i class="dropdown icon"></i>
            <div class="default text">{{'sylius.ui.select_taxon'|trans}}</div>
            <div class="menu"></div>
        </div>
    </div>
    <div class="ui divider"></div>
    {{ form_row(form.productTaxons) }}
</div>

Add ProductTaxonChoiceType and use it in ProductType
[CoreBundle] Add ProductTaxonChoiceType and use it in ProductType
