diff --git a/src/Entity/PriceInformations/Currency.php b/src/Entity/PriceInformations/Currency.php
index 7e51c4c4..889bc7c8 100644
--- a/src/Entity/PriceInformations/Currency.php
+++ b/src/Entity/PriceInformations/Currency.php
@@ -62,6 +62,7 @@ class Currency extends AbstractStructuralDBElement
      * @var string the 3-letter ISO code of the currency
      */
     #[Assert\Currency]
+    #[Assert\NotBlank]
     #[Groups(['extended', 'full', 'import'])]
     #[ORM\Column(type: Types::STRING)]
     protected string $iso_code = "";
@@ -113,12 +114,12 @@ class Currency extends AbstractStructuralDBElement
      *
      * @return string
      */
-    public function getIsoCode(): ?string
+    public function getIsoCode(): string
     {
         return $this->iso_code;
     }
 
-    public function setIsoCode(?string $iso_code): self
+    public function setIsoCode(string $iso_code): self
     {
         $this->iso_code = $iso_code;
 
diff --git a/src/Form/AdminPages/CurrencyAdminForm.php b/src/Form/AdminPages/CurrencyAdminForm.php
index a3514b80..0fab055d 100644
--- a/src/Form/AdminPages/CurrencyAdminForm.php
+++ b/src/Form/AdminPages/CurrencyAdminForm.php
@@ -42,7 +42,7 @@ class CurrencyAdminForm extends BaseEntityAdminForm
         $is_new = null === $entity->getID();
 
         $builder->add('iso_code', CurrencyType::class, [
-            'required' => false,
+            'required' => true,
             'label' => 'currency.edit.iso_code',
             'preferred_choices' => ['EUR', 'USD', 'GBP', 'JPY', 'CNY'],
             'disabled' => !$this->security->isGranted($is_new ? 'create' : 'edit', $entity),