Edit existing arrangement: When a user selects a new agreement plan, check if an installment (month) is removed, although there is a payment associated with it. (Elegxos_Gia_Elipsi_Minon_Me_Oikonomiki_Kinisi_Apo_To_Epilegmeno_Plano_Diakanonismou) blocks switching an existing arrangement to a different plan if that plan drops an installment that already has a payment.
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