[Flow] Update Domain object which has value objects as its property

[Rocky]

Hi,

The AbstractApplication has many expenses. Expense is value object. Thus I have below annotation:

    /**                                                                                                                
     * @var \Doctrine\Common\Collections\Collection<\Hwwcn\Sponsor\Domain\Model\Expense>                               
     * @ORM\ManyToMany(targetEntity="\Hwwcn\Sponsor\Domain\Model\Expense")                                                                                                                                                        
     */                                                                                                                
    protected $expenses;    

When I try to edit an Application, I got error saying: An exception occurred while executing 'INSERT INTO hwwcn_sponsor_domain_model_abstractapplication_expenses_join (sponsor_abstractapplication, hwwcn_model_expense) VALUES (?, ?)' with params ["b035cc35-ee1a-d812-dee8-f3d974fee4ce", "393834dac2c6652171b4cc790fdb8fc961d01d9d"]:
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'b035cc35-ee1a-d812-dee8-f3d974fee4ce-393834dac2c6652171b4cc790fd' for key 'PRIMARY'

Any idea how can I solve this problem please?