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diff --git a/‎tests/objectbox-java-test/src/main/java/io/objectbox/relation/AbstractRelationTest.java‎
Lines changed: 1 addition & 0 deletions b/‎tests/objectbox-java-test/src/main/java/io/objectbox/relation/AbstractRelationTest.java‎
Lines changed: 1 addition & 0 deletions
@@ -61,6 +61,7 @@ protected Customer putCustomer() {
 
     protected Order putOrder(@Nullable Customer customer, @Nullable String text) {
         Order order = new Order();
+        order.setCustomer(customer);
         order.setText(text);
         orderBox.put(order);
         return order;