Questione giuridica chiave
Whether the husband's earlier withdrawal and dismissal of a first modification action barred the later action by res judicata.
Decisione estratta
The earlier dismissal after withdrawal did not bar the later modification action because the withdrawal occurred at an early procedural stage and before service for response.
Motivazione estratta
Withdrawal-based discontinuance usually has res judicata effect, but exceptions exist where the withdrawal happens very early or replaces a non-admissible filing; here the later action was not precluded.