diff --git a/src/Entity/QRCode/QRCodePaymentIdentification.php b/src/Entity/QRCode/QRCodePaymentIdentification.php
index 7845c08..cb777b1 100644
--- a/src/Entity/QRCode/QRCodePaymentIdentification.php
+++ b/src/Entity/QRCode/QRCodePaymentIdentification.php
@@ -3,74 +3,54 @@ declare(strict_types=1);
 
 namespace App\Entity\QRCode;
 
+use App\Validator\BankPaymentIdentificationNumber;
 use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * Payment identification for QR code
  */
 class QRCodePaymentIdentification {
-    #[Assert\NotBlank(message: 'messages.fill_value')]
-    #[Assert\Length( // <<< Ano, mohl jsem si napsat vlastni validator ...
-        min: 1,
-        max: 10,
-        minMessage: 'messages.not_variable_symbol',
-        maxMessage: 'messages.not_variable_symbol',
-    )] // https://en.wikipedia.org/wiki/Variable_symbol
-    #[Assert\Positive(
+    #[BankPaymentIdentificationNumber(
         message: 'messages.not_variable_symbol',
     )]
-    private string $variableSymbol;
+    private ?string $variableSymbol;
 
-    #[Assert\NotBlank(message: 'messages.fill_value')]
-    #[Assert\Length(
-        min: 1,
-        max: 10,
-        minMessage: 'messages.not_specific_symbol',
-        maxMessage: 'messages.not_specific_symbol',
-    )] // https://cs.wikipedia.org/wiki/Specifick%C3%BD_symbol
-    #[Assert\Positive(
-        message: 'The {{ value }} is not a variable symbol.',
+    #[BankPaymentIdentificationNumber(
+        message: 'messages.not_specific_symbol',
     )]
-    private string $specificSymbol;
+    private ?string $specificSymbol;
 
-    #[Assert\NotBlank(message: 'messages.fill_value')]
-    #[Assert\Length(
-        min: 1,
-        max: 10,
-        minMessage: 'messages.not_constant_symbol',
-        maxMessage: 'messages.not_constant_symbol',
-    )]  // https://www.hyponamiru.cz/en/glossary/constant-symbol/
-    #[Assert\Positive(
+    #[BankPaymentIdentificationNumber(
         message: 'messages.not_constant_symbol',
-    )]
-    private string $constantSymbol;
+    )]  // https://www.hyponamiru.cz/en/glossary/constant-symbol/
+    private ?string $constantSymbol;
 
-    public function getVariableSymbol(): string
+    public function getVariableSymbol(): ?string
     {
         return $this->variableSymbol;
     }
 
-    public function setVariableSymbol(string $variableSymbol): void
+    public function setVariableSymbol(?string $variableSymbol): void
     {
         $this->variableSymbol = $variableSymbol;
     }
 
-    public function getSpecificSymbol(): string
+    public function getSpecificSymbol(): ?string
     {
         return $this->specificSymbol;
     }
 
-    public function setSpecificSymbol(string $specificSymbol): void
+    public function setSpecificSymbol(?string $specificSymbol): void
     {
         $this->specificSymbol = $specificSymbol;
     }
 
-    public function getConstantSymbol(): string
+    public function getConstantSymbol(): ?string
     {
         return $this->constantSymbol;
     }
 
-    public function setConstantSymbol(string $constantSymbol): void
+    public function setConstantSymbol(?string $constantSymbol): void
     {
         $this->constantSymbol = $constantSymbol;
     }
diff --git a/src/Validator/BankPaymentIdentificationNumber.php b/src/Validator/BankPaymentIdentificationNumber.php
new file mode 100644
index 0000000..2f2b14e
--- /dev/null
+++ b/src/Validator/BankPaymentIdentificationNumber.php
@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Validator;
+
+use Symfony\Component\Validator\Constraint;
+
+#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class BankPaymentIdentificationNumber extends Constraint
+{
+    public const NOT_CURRENCY_ERROR = '478a18e7-95ba-473d-9101-cabd45e49115';
+
+    protected const ERROR_NAMES = [
+        self::NOT_CURRENCY_ERROR => 'NOT_BANKID_NUMBER_ERROR',
+    ];
+
+    public string $message = 'This value should be bank identification number.';
+
+    /**
+     * @param mixed|null $options
+     * @param string|null $message
+     * @param array<string>|null $groups
+     * @param mixed|null $payload
+     */
+    public function __construct(mixed $options = null, string $message = null, array $groups = null, mixed $payload = null)
+    {
+        parent::__construct($options ?? [], $groups, $payload);
+
+        $this->message = $message ?? $this->message;
+    }
+}
diff --git a/src/Validator/BankPaymentIdentificationNumberValidator.php b/src/Validator/BankPaymentIdentificationNumberValidator.php
new file mode 100644
index 0000000..3459da2
--- /dev/null
+++ b/src/Validator/BankPaymentIdentificationNumberValidator.php
@@ -0,0 +1,35 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Validator;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+class BankPaymentIdentificationNumberValidator extends ConstraintValidator
+{
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof BankPaymentIdentificationNumber) {
+            throw new UnexpectedTypeException($constraint, Money::class);
+        }
+
+        if (null === $value || '' === $value) {
+            return ;
+        }
+
+        if (is_string($value) === false) {
+            throw new UnexpectedValueException($value, "string");
+        }
+
+        if (strlen($value) <= 10 && filter_var($value, FILTER_VALIDATE_INT) !== false) {
+            return ;
+        }
+
+        $this->context->buildViolation($constraint->message)
+            ->setParameter('{{ string }}', $value)
+            ->addViolation();
+    }
+}
diff --git a/tests/Validator/BankPaymentIdentificationNumberValidatorTest.php b/tests/Validator/BankPaymentIdentificationNumberValidatorTest.php
new file mode 100644
index 0000000..d9e08e9
--- /dev/null
+++ b/tests/Validator/BankPaymentIdentificationNumberValidatorTest.php
@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Validator;
+
+use App\Validator\BankPaymentIdentificationNumber;
+use App\Validator\BankPaymentIdentificationNumberValidator;
+
+class BankPaymentIdentificationNumberValidatorTest extends ValidatorTestCase
+{
+    /**
+     * @dataProvider successDp
+     * @param string $generatedValue
+     * @return void
+     */
+    public function testSuccess(string $generatedValue): void {
+        $bankPaymentIdentificationValidator = new BankPaymentIdentificationNumberValidator();
+        $bankPaymentIdentificationValidator->initialize($this->createExecutionContext(false));
+        $bankPaymentIdentificationValidator->validate($generatedValue, new BankPaymentIdentificationNumber(['message' => 'foo']));
+    }
+
+    private function successDp(): array {
+        return [['122'], ['1234567890'], ['1']];
+    }
+
+    /**
+     * @dataProvider failureDp
+     * @param string $generatedValue
+     * @return void
+     */
+    public function testFailure(string $generatedValue): void {
+        $bankPaymentIdentificationValidator = new BankPaymentIdentificationNumberValidator();
+        $bankPaymentIdentificationValidator->initialize($this->createExecutionContext(true));
+        $bankPaymentIdentificationValidator->validate($generatedValue, new BankPaymentIdentificationNumber(['message' => 'foo']));
+    }
+
+    private function failureDp(): array {
+        return [['122.b'], ['a.a'], ['a'], ['2.040'], ['2,a'], ['122.1'], ['12345678901']];
+    }
+}