fix: don't check pickup unless transportation by bus is selected

src/Form/Model/ParticipantData.php

@@ -81,7 +81,13 @@ class ParticipantData
     #[Assert\Callback]
     public function assertPickupSelected(ExecutionContextInterface $context): void
     {
-        if (null !== $this->transportationServiceTo && null === $this->pickup) {
+        $transportationServiceTo = $this->transportationServiceTo;
+
+        if (
+            null !== $transportationServiceTo
+            && 'BUS' === $transportationServiceTo->subType
+            && null === $this->pickup
+        ) {
             $context->buildViolation('Bitte auswählen')
                 ->atPath('pickup')
                 ->addViolation()