'required|string|max:255', 'value' => 'required|numeric|min:0.01', 'due_date' => 'required|date', 'student_id' => 'nullable|integer|exists:students,id', 'financial_plan_account_id' => 'nullable|integer|exists:financial_plan_accounts,id', 'obs' => 'nullable|string|max:1000', ]; } }