a

src/main/java/com/sasiedzi/event/domain/UserAccount.java

@@ -25,7 +25,7 @@ public class UserAccount implements Serializable {
     @Column(name = "name")
     private String name;
 
-    @ManyToMany(fetch = FetchType.EAGER)
+    @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
     @JoinTable(
         name = "rel_user_account__user",
         joinColumns = @JoinColumn(name = "user_account_id"),

src/main/java/com/sasiedzi/event/service/EventService.java

@@ -185,9 +185,10 @@ public class EventService {
                 .forEach(registration -> {
                     String login = registration.getUser().getLogin();
                     UserAccount userAccount = accountsByLogin.get(login);
-                    if (userAccount != null) {
+                    if (userAccount == null) {
                         userAccount = new UserAccount();
                         userAccount.setName(registration.getUser().getName());
+                        userAccount.getUsers().add(registration.getUser());
                         userAccount = userAccountRepository.save(userAccount);
                     }
                     accountsToCharge.add(userAccount);
@@ -202,7 +203,7 @@ public class EventService {
                 TransactionItem playerCharge = new TransactionItem();
                 playerCharge.setEvent(event);
                 playerCharge.setAmount(event.getCost().divide(BigDecimal.valueOf(-accountsToCharge.size()), 2, RoundingMode.HALF_UP));
-                playerCharge.setUserAccount(accountsByAccountName.get(fieldServiceAccountName));
+                playerCharge.setUserAccount(userAccount);
                 playerCharge.setTransaction(transaction);
                 transaction.getTransactionItems().add(playerCharge);
             });