CaracoleBundle/Resources/views/admin/reduction/field/amount.html.twig

{% set item = entity.instance %}
{% if item.unit == constant('App\\Entity\\Config\\Unit::UNIT_PERCENT') %}
    {% set unit = '%' %}
{% elseif item.unit == constant('App\\Entity\\Config\\Unit::UNIT_AMOUNT') %}
    {% set unit = '€' %}
{% endif %}

-{{ item.value }}{{ unit }}